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Finding the Fourth Proportional to 551.61, 762.39 and 405.27

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Solution

The fourth proportional to 551.61, 762.39 and 405.27 is: 560.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.61 : 762.39 = 405.27 : x
  2. Step 2: Convert to fraction form
    551.61/762.39 = 405.27/x
  3. Step 3: Cross multiply
    551.61x = 762.39 × 405.27
  4. Step 4: Simplify right side
    551.61x = 308,973.80
  5. Step 5: Solve for x
    x = 308,973.80/551.61
  6. Step 6: Final answer
    x = 560.13

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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.