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Finding the Fourth Proportional to 658.78, 987.85 and 384.96

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Solution

The fourth proportional to 658.78, 987.85 and 384.96 is: 577.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.78 : 987.85 = 384.96 : x
  2. Step 2: Convert to fraction form
    658.78/987.85 = 384.96/x
  3. Step 3: Cross multiply
    658.78x = 987.85 × 384.96
  4. Step 4: Simplify right side
    658.78x = 380,282.74
  5. Step 5: Solve for x
    x = 380,282.74/658.78
  6. Step 6: Final answer
    x = 577.25

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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.