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Finding the Fourth Proportional to 1,121.08, 1,681.92 and 658.04

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Solution

The fourth proportional to 1,121.08, 1,681.92 and 658.04 is: 987.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.08 : 1,681.92 = 658.04 : x
  2. Step 2: Convert to fraction form
    1,121.08/1,681.92 = 658.04/x
  3. Step 3: Cross multiply
    1,121.08x = 1,681.92 × 658.04
  4. Step 4: Simplify right side
    1,121.08x = 1,106,770.64
  5. Step 5: Solve for x
    x = 1,106,770.64/1,121.08
  6. Step 6: Final answer
    x = 987.24

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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.