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Finding the Fourth Proportional to 66,499.52, 91,781.24 and 39,643.76

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Solution

The fourth proportional to 66,499.52, 91,781.24 and 39,643.76 is: 54,715.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,499.52 : 91,781.24 = 39,643.76 : x
  2. Step 2: Convert to fraction form
    66,499.52/91,781.24 = 39,643.76/x
  3. Step 3: Cross multiply
    66,499.52x = 91,781.24 × 39,643.76
  4. Step 4: Simplify right side
    66,499.52x = 3,638,553,482.30
  5. Step 5: Solve for x
    x = 3,638,553,482.30/66,499.52
  6. Step 6: Final answer
    x = 54,715.49

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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.