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Finding the Fourth Proportional to 66,497.66, 91,778.64 and 39,641.88

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Solution

The fourth proportional to 66,497.66, 91,778.64 and 39,641.88 is: 54,712.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,497.66 : 91,778.64 = 39,641.88 : x
  2. Step 2: Convert to fraction form
    66,497.66/91,778.64 = 39,641.88/x
  3. Step 3: Cross multiply
    66,497.66x = 91,778.64 × 39,641.88
  4. Step 4: Simplify right side
    66,497.66x = 3,638,277,833.44
  5. Step 5: Solve for x
    x = 3,638,277,833.44/66,497.66
  6. Step 6: Final answer
    x = 54,712.87

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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.