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Finding the Fourth Proportional to 72,755.52, 109,132.88 and 18,720.16

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Solution

The fourth proportional to 72,755.52, 109,132.88 and 18,720.16 is: 28,080.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,755.52 : 109,132.88 = 18,720.16 : x
  2. Step 2: Convert to fraction form
    72,755.52/109,132.88 = 18,720.16/x
  3. Step 3: Cross multiply
    72,755.52x = 109,132.88 × 18,720.16
  4. Step 4: Simplify right side
    72,755.52x = 2,042,984,974.86
  5. Step 5: Solve for x
    x = 2,042,984,974.86/72,755.52
  6. Step 6: Final answer
    x = 28,080.14

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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.