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Finding the Fourth Proportional to 66,491.25, 91,757.90 and 42,617.91

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Solution

The fourth proportional to 66,491.25, 91,757.90 and 42,617.91 is: 58,812.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,491.25 : 91,757.90 = 42,617.91 : x
  2. Step 2: Convert to fraction form
    66,491.25/91,757.90 = 42,617.91/x
  3. Step 3: Cross multiply
    66,491.25x = 91,757.90 × 42,617.91
  4. Step 4: Simplify right side
    66,491.25x = 3,910,529,927.59
  5. Step 5: Solve for x
    x = 3,910,529,927.59/66,491.25
  6. Step 6: Final answer
    x = 58,812.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.