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Finding the Fourth Proportional to 688.74, 1,032.63 and 551.75

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Solution

The fourth proportional to 688.74, 1,032.63 and 551.75 is: 827.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.74 : 1,032.63 = 551.75 : x
  2. Step 2: Convert to fraction form
    688.74/1,032.63 = 551.75/x
  3. Step 3: Cross multiply
    688.74x = 1,032.63 × 551.75
  4. Step 4: Simplify right side
    688.74x = 569,753.60
  5. Step 5: Solve for x
    x = 569,753.60/688.74
  6. Step 6: Final answer
    x = 827.24

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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.