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Finding the Fourth Proportional to 1,125.14, 1,687.72 and 394.55

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Solution

The fourth proportional to 1,125.14, 1,687.72 and 394.55 is: 591.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.14 : 1,687.72 = 394.55 : x
  2. Step 2: Convert to fraction form
    1,125.14/1,687.72 = 394.55/x
  3. Step 3: Cross multiply
    1,125.14x = 1,687.72 × 394.55
  4. Step 4: Simplify right side
    1,125.14x = 665,887.57
  5. Step 5: Solve for x
    x = 665,887.57/1,125.14
  6. Step 6: Final answer
    x = 591.82

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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.