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Finding the Fourth Proportional to 930.87, 1,396.74 and 658.71

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Solution

The fourth proportional to 930.87, 1,396.74 and 658.71 is: 988.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.87 : 1,396.74 = 658.71 : x
  2. Step 2: Convert to fraction form
    930.87/1,396.74 = 658.71/x
  3. Step 3: Cross multiply
    930.87x = 1,396.74 × 658.71
  4. Step 4: Simplify right side
    930.87x = 920,046.61
  5. Step 5: Solve for x
    x = 920,046.61/930.87
  6. Step 6: Final answer
    x = 988.37

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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.