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Finding the Fourth Proportional to 1,129.28, 1,693.92 and 551.84

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Solution

The fourth proportional to 1,129.28, 1,693.92 and 551.84 is: 827.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.28 : 1,693.92 = 551.84 : x
  2. Step 2: Convert to fraction form
    1,129.28/1,693.92 = 551.84/x
  3. Step 3: Cross multiply
    1,129.28x = 1,693.92 × 551.84
  4. Step 4: Simplify right side
    1,129.28x = 934,772.81
  5. Step 5: Solve for x
    x = 934,772.81/1,129.28
  6. Step 6: Final answer
    x = 827.76

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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.