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Finding the Fourth Proportional to 72,431.20, 108,646.80 and 65,432.80

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Solution

The fourth proportional to 72,431.20, 108,646.80 and 65,432.80 is: 98,149.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,431.20 : 108,646.80 = 65,432.80 : x
  2. Step 2: Convert to fraction form
    72,431.20/108,646.80 = 65,432.80/x
  3. Step 3: Cross multiply
    72,431.20x = 108,646.80 × 65,432.80
  4. Step 4: Simplify right side
    72,431.20x = 7,109,064,335.04
  5. Step 5: Solve for x
    x = 7,109,064,335.04/72,431.20
  6. Step 6: Final answer
    x = 98,149.20

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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.