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Finding the Fourth Proportional to 989.42, 1,365.98 and 658.31

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Solution

The fourth proportional to 989.42, 1,365.98 and 658.31 is: 908.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.42 : 1,365.98 = 658.31 : x
  2. Step 2: Convert to fraction form
    989.42/1,365.98 = 658.31/x
  3. Step 3: Cross multiply
    989.42x = 1,365.98 × 658.31
  4. Step 4: Simplify right side
    989.42x = 899,228.17
  5. Step 5: Solve for x
    x = 899,228.17/989.42
  6. Step 6: Final answer
    x = 908.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.