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Finding the Fourth Proportional to 1,127.64, 1,691.40 and 434.18

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Solution

The fourth proportional to 1,127.64, 1,691.40 and 434.18 is: 651.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.64 : 1,691.40 = 434.18 : x
  2. Step 2: Convert to fraction form
    1,127.64/1,691.40 = 434.18/x
  3. Step 3: Cross multiply
    1,127.64x = 1,691.40 × 434.18
  4. Step 4: Simplify right side
    1,127.64x = 734,372.05
  5. Step 5: Solve for x
    x = 734,372.05/1,127.64
  6. Step 6: Final answer
    x = 651.25

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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.