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Finding the Fourth Proportional to 658.96, 986.89 and 521.08

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Solution

The fourth proportional to 658.96, 986.89 and 521.08 is: 780.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.96 : 986.89 = 521.08 : x
  2. Step 2: Convert to fraction form
    658.96/986.89 = 521.08/x
  3. Step 3: Cross multiply
    658.96x = 986.89 × 521.08
  4. Step 4: Simplify right side
    658.96x = 514,248.64
  5. Step 5: Solve for x
    x = 514,248.64/658.96
  6. Step 6: Final answer
    x = 780.39

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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.