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Finding the Fourth Proportional to 1,124.39, 1,686.70 and 344.39

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Solution

The fourth proportional to 1,124.39, 1,686.70 and 344.39 is: 516.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.39 : 1,686.70 = 344.39 : x
  2. Step 2: Convert to fraction form
    1,124.39/1,686.70 = 344.39/x
  3. Step 3: Cross multiply
    1,124.39x = 1,686.70 × 344.39
  4. Step 4: Simplify right side
    1,124.39x = 580,874.61
  5. Step 5: Solve for x
    x = 580,874.61/1,124.39
  6. Step 6: Final answer
    x = 516.61

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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.