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Finding the Fourth Proportional to 1,188.90, 1,781.29 and 725.24

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Solution

The fourth proportional to 1,188.90, 1,781.29 and 725.24 is: 1,086.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.90 : 1,781.29 = 725.24 : x
  2. Step 2: Convert to fraction form
    1,188.90/1,781.29 = 725.24/x
  3. Step 3: Cross multiply
    1,188.90x = 1,781.29 × 725.24
  4. Step 4: Simplify right side
    1,188.90x = 1,291,862.76
  5. Step 5: Solve for x
    x = 1,291,862.76/1,188.90
  6. Step 6: Final answer
    x = 1,086.60

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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.