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Finding the Fourth Proportional to 63,642.87, 87,871.10 and 39,780.27

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Solution

The fourth proportional to 63,642.87, 87,871.10 and 39,780.27 is: 54,924.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    63,642.87 : 87,871.10 = 39,780.27 : x
  2. Step 2: Convert to fraction form
    63,642.87/87,871.10 = 39,780.27/x
  3. Step 3: Cross multiply
    63,642.87x = 87,871.10 × 39,780.27
  4. Step 4: Simplify right side
    63,642.87x = 3,495,535,884.30
  5. Step 5: Solve for x
    x = 3,495,535,884.30/63,642.87
  6. Step 6: Final answer
    x = 54,924.23

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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.