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Finding the Fourth Proportional to 1,125.68, 1,687.91 and 385.07

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Solution

The fourth proportional to 1,125.68, 1,687.91 and 385.07 is: 577.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.68 : 1,687.91 = 385.07 : x
  2. Step 2: Convert to fraction form
    1,125.68/1,687.91 = 385.07/x
  3. Step 3: Cross multiply
    1,125.68x = 1,687.91 × 385.07
  4. Step 4: Simplify right side
    1,125.68x = 649,953.14
  5. Step 5: Solve for x
    x = 649,953.14/1,125.68
  6. Step 6: Final answer
    x = 577.39

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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.