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Finding the Fourth Proportional to 19,920,609.60, 29,880,914.40 and 18,219,998.40

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Solution

The fourth proportional to 19,920,609.60, 29,880,914.40 and 18,219,998.40 is: 27,329,997.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920,609.60 : 29,880,914.40 = 18,219,998.40 : x
  2. Step 2: Convert to fraction form
    19,920,609.60/29,880,914.40 = 18,219,998.40/x
  3. Step 3: Cross multiply
    19,920,609.60x = 29,880,914.40 × 18,219,998.40
  4. Step 4: Simplify right side
    19,920,609.60x = 544,430,212,558,536.88
  5. Step 5: Solve for x
    x = 544,430,212,558,536.88/19,920,609.60
  6. Step 6: Final answer
    x = 27,329,997.60

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.