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Finding the Fourth Proportional to 81,390.72, 122,127.76 and 38,744.41

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Solution

The fourth proportional to 81,390.72, 122,127.76 and 38,744.41 is: 58,136.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.72 : 122,127.76 = 38,744.41 : x
  2. Step 2: Convert to fraction form
    81,390.72/122,127.76 = 38,744.41/x
  3. Step 3: Cross multiply
    81,390.72x = 122,127.76 × 38,744.41
  4. Step 4: Simplify right side
    81,390.72x = 4,731,768,134.27
  5. Step 5: Solve for x
    x = 4,731,768,134.27/81,390.72
  6. Step 6: Final answer
    x = 58,136.46

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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.