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Finding the Fourth Proportional to 63,776.47, 87,974.88 and 39,861.64

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Solution

The fourth proportional to 63,776.47, 87,974.88 and 39,861.64 is: 54,986.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,776.47 : 87,974.88 = 39,861.64 : x
  2. Step 2: Convert to fraction form
    63,776.47/87,974.88 = 39,861.64/x
  3. Step 3: Cross multiply
    63,776.47x = 87,974.88 × 39,861.64
  4. Step 4: Simplify right side
    63,776.47x = 3,506,822,995.60
  5. Step 5: Solve for x
    x = 3,506,822,995.60/63,776.47
  6. Step 6: Final answer
    x = 54,986.16

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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.