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Finding the Fourth Proportional to 551.12, 761.31 and 385.25

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Solution

The fourth proportional to 551.12, 761.31 and 385.25 is: 532.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.12 : 761.31 = 385.25 : x
  2. Step 2: Convert to fraction form
    551.12/761.31 = 385.25/x
  3. Step 3: Cross multiply
    551.12x = 761.31 × 385.25
  4. Step 4: Simplify right side
    551.12x = 293,294.68
  5. Step 5: Solve for x
    x = 293,294.68/551.12
  6. Step 6: Final answer
    x = 532.18

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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.