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Finding the Fourth Proportional to 1,127.32, 1,691.18 and 397.32

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Solution

The fourth proportional to 1,127.32, 1,691.18 and 397.32 is: 596.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.32 : 1,691.18 = 397.32 : x
  2. Step 2: Convert to fraction form
    1,127.32/1,691.18 = 397.32/x
  3. Step 3: Cross multiply
    1,127.32x = 1,691.18 × 397.32
  4. Step 4: Simplify right side
    1,127.32x = 671,939.64
  5. Step 5: Solve for x
    x = 671,939.64/1,127.32
  6. Step 6: Final answer
    x = 596.05

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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.