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Finding the Fourth Proportional to 1,121.62, 1,681.88 and 472.18

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Solution

The fourth proportional to 1,121.62, 1,681.88 and 472.18 is: 708.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.62 : 1,681.88 = 472.18 : x
  2. Step 2: Convert to fraction form
    1,121.62/1,681.88 = 472.18/x
  3. Step 3: Cross multiply
    1,121.62x = 1,681.88 × 472.18
  4. Step 4: Simplify right side
    1,121.62x = 794,150.10
  5. Step 5: Solve for x
    x = 794,150.10/1,121.62
  6. Step 6: Final answer
    x = 708.04

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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.