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Finding the Fourth Proportional to 72,177.20, 108,136.20 and 61,809.20

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Solution

The fourth proportional to 72,177.20, 108,136.20 and 61,809.20 is: 92,602.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,177.20 : 108,136.20 = 61,809.20 : x
  2. Step 2: Convert to fraction form
    72,177.20/108,136.20 = 61,809.20/x
  3. Step 3: Cross multiply
    72,177.20x = 108,136.20 × 61,809.20
  4. Step 4: Simplify right side
    72,177.20x = 6,683,812,013.04
  5. Step 5: Solve for x
    x = 6,683,812,013.04/72,177.20
  6. Step 6: Final answer
    x = 92,602.82

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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.