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Finding the Fourth Proportional to 72,086.40, 108,129.60 and 67,712.40

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Solution

The fourth proportional to 72,086.40, 108,129.60 and 67,712.40 is: 101,568.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,086.40 : 108,129.60 = 67,712.40 : x
  2. Step 2: Convert to fraction form
    72,086.40/108,129.60 = 67,712.40/x
  3. Step 3: Cross multiply
    72,086.40x = 108,129.60 × 67,712.40
  4. Step 4: Simplify right side
    72,086.40x = 7,321,714,727.04
  5. Step 5: Solve for x
    x = 7,321,714,727.04/72,086.40
  6. Step 6: Final answer
    x = 101,568.60

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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.