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Finding the Fourth Proportional to 1,123.92, 1,551 and 658.20

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Solution

The fourth proportional to 1,123.92, 1,551 and 658.20 is: 908.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,123.92 : 1,551 = 658.20 : x
  2. Step 2: Convert to fraction form
    1,123.92/1,551 = 658.20/x
  3. Step 3: Cross multiply
    1,123.92x = 1,551 × 658.20
  4. Step 4: Simplify right side
    1,123.92x = 1,020,868.20
  5. Step 5: Solve for x
    x = 1,020,868.20/1,123.92
  6. Step 6: Final answer
    x = 908.31

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Double scale
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1.5x scale

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.