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Finding the Fourth Proportional to 1,125.86, 1,687.56 and 715.18

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Solution

The fourth proportional to 1,125.86, 1,687.56 and 715.18 is: 1,071.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.86 : 1,687.56 = 715.18 : x
  2. Step 2: Convert to fraction form
    1,125.86/1,687.56 = 715.18/x
  3. Step 3: Cross multiply
    1,125.86x = 1,687.56 × 715.18
  4. Step 4: Simplify right side
    1,125.86x = 1,206,909.16
  5. Step 5: Solve for x
    x = 1,206,909.16/1,125.86
  6. Step 6: Final answer
    x = 1,071.99

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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.