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Finding the Fourth Proportional to 72,129.20, 108,219.72 and 63,471.92

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Solution

The fourth proportional to 72,129.20, 108,219.72 and 63,471.92 is: 95,230.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,129.20 : 108,219.72 = 63,471.92 : x
  2. Step 2: Convert to fraction form
    72,129.20/108,219.72 = 63,471.92/x
  3. Step 3: Cross multiply
    72,129.20x = 108,219.72 × 63,471.92
  4. Step 4: Simplify right side
    72,129.20x = 6,868,913,410.26
  5. Step 5: Solve for x
    x = 6,868,913,410.26/72,129.20
  6. Step 6: Final answer
    x = 95,230.69

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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.