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Finding the Fourth Proportional to 91,424.40, 137,136.60 and 66,346.80

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Solution

The fourth proportional to 91,424.40, 137,136.60 and 66,346.80 is: 99,520.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,424.40 : 137,136.60 = 66,346.80 : x
  2. Step 2: Convert to fraction form
    91,424.40/137,136.60 = 66,346.80/x
  3. Step 3: Cross multiply
    91,424.40x = 137,136.60 × 66,346.80
  4. Step 4: Simplify right side
    91,424.40x = 9,098,574,572.88
  5. Step 5: Solve for x
    x = 9,098,574,572.88/91,424.40
  6. Step 6: Final answer
    x = 99,520.20

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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.