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Finding the Fourth Proportional to 91,728.60, 137,592.90 and 39,240.60

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Solution

The fourth proportional to 91,728.60, 137,592.90 and 39,240.60 is: 58,860.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,728.60 : 137,592.90 = 39,240.60 : x
  2. Step 2: Convert to fraction form
    91,728.60/137,592.90 = 39,240.60/x
  3. Step 3: Cross multiply
    91,728.60x = 137,592.90 × 39,240.60
  4. Step 4: Simplify right side
    91,728.60x = 5,399,227,951.74
  5. Step 5: Solve for x
    x = 5,399,227,951.74/91,728.60
  6. Step 6: Final answer
    x = 58,860.90

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1.5x scale

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.