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Finding the Fourth Proportional to 1,008.80, 1,391.36 and 658.88

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Solution

The fourth proportional to 1,008.80, 1,391.36 and 658.88 is: 908.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.80 : 1,391.36 = 658.88 : x
  2. Step 2: Convert to fraction form
    1,008.80/1,391.36 = 658.88/x
  3. Step 3: Cross multiply
    1,008.80x = 1,391.36 × 658.88
  4. Step 4: Simplify right side
    1,008.80x = 916,739.28
  5. Step 5: Solve for x
    x = 916,739.28/1,008.80
  6. Step 6: Final answer
    x = 908.74

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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.