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Finding the Fourth Proportional to 1,125.74, 1,687.46 and 394.72

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Solution

The fourth proportional to 1,125.74, 1,687.46 and 394.72 is: 591.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.74 : 1,687.46 = 394.72 : x
  2. Step 2: Convert to fraction form
    1,125.74/1,687.46 = 394.72/x
  3. Step 3: Cross multiply
    1,125.74x = 1,687.46 × 394.72
  4. Step 4: Simplify right side
    1,125.74x = 666,074.21
  5. Step 5: Solve for x
    x = 666,074.21/1,125.74
  6. Step 6: Final answer
    x = 591.68

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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.