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Finding the Fourth Proportional to 1,658.48, 2,487.55 and 425.85

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Solution

The fourth proportional to 1,658.48, 2,487.55 and 425.85 is: 638.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,658.48 : 2,487.55 = 425.85 : x
  2. Step 2: Convert to fraction form
    1,658.48/2,487.55 = 425.85/x
  3. Step 3: Cross multiply
    1,658.48x = 2,487.55 × 425.85
  4. Step 4: Simplify right side
    1,658.48x = 1,059,323.17
  5. Step 5: Solve for x
    x = 1,059,323.17/1,658.48
  6. Step 6: Final answer
    x = 638.73

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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.