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Finding the Fourth Proportional to 42,658.52, 63,987.78 and 21,868.76

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Solution

The fourth proportional to 42,658.52, 63,987.78 and 21,868.76 is: 32,803.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,658.52 : 63,987.78 = 21,868.76 : x
  2. Step 2: Convert to fraction form
    42,658.52/63,987.78 = 21,868.76/x
  3. Step 3: Cross multiply
    42,658.52x = 63,987.78 × 21,868.76
  4. Step 4: Simplify right side
    42,658.52x = 1,399,333,403.75
  5. Step 5: Solve for x
    x = 1,399,333,403.75/42,658.52
  6. Step 6: Final answer
    x = 32,803.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.