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Finding the Fourth Proportional to 1,129.59, 1,691.96 and 551.25

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Solution

The fourth proportional to 1,129.59, 1,691.96 and 551.25 is: 825.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.59 : 1,691.96 = 551.25 : x
  2. Step 2: Convert to fraction form
    1,129.59/1,691.96 = 551.25/x
  3. Step 3: Cross multiply
    1,129.59x = 1,691.96 × 551.25
  4. Step 4: Simplify right side
    1,129.59x = 932,690.19
  5. Step 5: Solve for x
    x = 932,690.19/1,129.59
  6. Step 6: Final answer
    x = 825.69

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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.