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Finding the Fourth Proportional to 81,439.68, 122,019.24 and 63,663.40

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Solution

The fourth proportional to 81,439.68, 122,019.24 and 63,663.40 is: 95,385.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,439.68 : 122,019.24 = 63,663.40 : x
  2. Step 2: Convert to fraction form
    81,439.68/122,019.24 = 63,663.40/x
  3. Step 3: Cross multiply
    81,439.68x = 122,019.24 × 63,663.40
  4. Step 4: Simplify right side
    81,439.68x = 7,768,159,683.82
  5. Step 5: Solve for x
    x = 7,768,159,683.82/81,439.68
  6. Step 6: Final answer
    x = 95,385.44

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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.