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Finding the Fourth Proportional to 84,807.28, 126,948.48 and 72,210.16

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Solution

The fourth proportional to 84,807.28, 126,948.48 and 72,210.16 is: 108,091.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,807.28 : 126,948.48 = 72,210.16 : x
  2. Step 2: Convert to fraction form
    84,807.28/126,948.48 = 72,210.16/x
  3. Step 3: Cross multiply
    84,807.28x = 126,948.48 × 72,210.16
  4. Step 4: Simplify right side
    84,807.28x = 9,166,970,052.56
  5. Step 5: Solve for x
    x = 9,166,970,052.56/84,807.28
  6. Step 6: Final answer
    x = 108,091.78

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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.