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Finding the Fourth Proportional to 862.62, 1,291.40 and 658.02

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Solution

The fourth proportional to 862.62, 1,291.40 and 658.02 is: 985.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.62 : 1,291.40 = 658.02 : x
  2. Step 2: Convert to fraction form
    862.62/1,291.40 = 658.02/x
  3. Step 3: Cross multiply
    862.62x = 1,291.40 × 658.02
  4. Step 4: Simplify right side
    862.62x = 849,767.03
  5. Step 5: Solve for x
    x = 849,767.03/862.62
  6. Step 6: Final answer
    x = 985.10

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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.