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Finding the Fourth Proportional to 91,287.70, 136,931.55 and 42,135.70

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Solution

The fourth proportional to 91,287.70, 136,931.55 and 42,135.70 is: 63,203.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,287.70 : 136,931.55 = 42,135.70 : x
  2. Step 2: Convert to fraction form
    91,287.70/136,931.55 = 42,135.70/x
  3. Step 3: Cross multiply
    91,287.70x = 136,931.55 × 42,135.70
  4. Step 4: Simplify right side
    91,287.70x = 5,769,706,711.34
  5. Step 5: Solve for x
    x = 5,769,706,711.34/91,287.70
  6. Step 6: Final answer
    x = 63,203.55

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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.