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Finding the Fourth Proportional to 19,920,603.60, 29,880,905.40 and 18,219,992.40

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Solution

The fourth proportional to 19,920,603.60, 29,880,905.40 and 18,219,992.40 is: 27,329,988.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920,603.60 : 29,880,905.40 = 18,219,992.40 : x
  2. Step 2: Convert to fraction form
    19,920,603.60/29,880,905.40 = 18,219,992.40/x
  3. Step 3: Cross multiply
    19,920,603.60x = 29,880,905.40 × 18,219,992.40
  4. Step 4: Simplify right side
    19,920,603.60x = 544,429,869,293,118.88
  5. Step 5: Solve for x
    x = 544,429,869,293,118.88/19,920,603.60
  6. Step 6: Final answer
    x = 27,329,988.60

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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.