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Finding the Fourth Proportional to 625.89, 861.74 and 551.15

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Solution

The fourth proportional to 625.89, 861.74 and 551.15 is: 758.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.89 : 861.74 = 551.15 : x
  2. Step 2: Convert to fraction form
    625.89/861.74 = 551.15/x
  3. Step 3: Cross multiply
    625.89x = 861.74 × 551.15
  4. Step 4: Simplify right side
    625.89x = 474,949.34
  5. Step 5: Solve for x
    x = 474,949.34/625.89
  6. Step 6: Final answer
    x = 758.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.