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Finding the Fourth Proportional to 989.54, 1,366.18 and 658.26

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Solution

The fourth proportional to 989.54, 1,366.18 and 658.26 is: 908.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.54 : 1,366.18 = 658.26 : x
  2. Step 2: Convert to fraction form
    989.54/1,366.18 = 658.26/x
  3. Step 3: Cross multiply
    989.54x = 1,366.18 × 658.26
  4. Step 4: Simplify right side
    989.54x = 899,301.65
  5. Step 5: Solve for x
    x = 899,301.65/989.54
  6. Step 6: Final answer
    x = 908.81

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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.