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Finding the Fourth Proportional to 66,405.91, 91,641.28 and 36,192.89

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Solution

The fourth proportional to 66,405.91, 91,641.28 and 36,192.89 is: 49,946.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,405.91 : 91,641.28 = 36,192.89 : x
  2. Step 2: Convert to fraction form
    66,405.91/91,641.28 = 36,192.89/x
  3. Step 3: Cross multiply
    66,405.91x = 91,641.28 × 36,192.89
  4. Step 4: Simplify right side
    66,405.91x = 3,316,762,321.86
  5. Step 5: Solve for x
    x = 3,316,762,321.86/66,405.91
  6. Step 6: Final answer
    x = 49,946.80

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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.