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Finding the Fourth Proportional to 19,980.80, 29,971.20 and 18,905.60

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Solution

The fourth proportional to 19,980.80, 29,971.20 and 18,905.60 is: 28,358.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,980.80 : 29,971.20 = 18,905.60 : x
  2. Step 2: Convert to fraction form
    19,980.80/29,971.20 = 18,905.60/x
  3. Step 3: Cross multiply
    19,980.80x = 29,971.20 × 18,905.60
  4. Step 4: Simplify right side
    19,980.80x = 566,623,518.72
  5. Step 5: Solve for x
    x = 566,623,518.72/19,980.80
  6. Step 6: Final answer
    x = 28,358.40

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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.