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Finding the Fourth Proportional to 1,124.11, 1,686.17 and 393.70

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Solution

The fourth proportional to 1,124.11, 1,686.17 and 393.70 is: 590.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.11 : 1,686.17 = 393.70 : x
  2. Step 2: Convert to fraction form
    1,124.11/1,686.17 = 393.70/x
  3. Step 3: Cross multiply
    1,124.11x = 1,686.17 × 393.70
  4. Step 4: Simplify right side
    1,124.11x = 663,845.13
  5. Step 5: Solve for x
    x = 663,845.13/1,124.11
  6. Step 6: Final answer
    x = 590.55

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Double scale
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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.