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Finding the Fourth Proportional to 582.31, 871.39 and 427.87

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Solution

The fourth proportional to 582.31, 871.39 and 427.87 is: 640.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    582.31 : 871.39 = 427.87 : x
  2. Step 2: Convert to fraction form
    582.31/871.39 = 427.87/x
  3. Step 3: Cross multiply
    582.31x = 871.39 × 427.87
  4. Step 4: Simplify right side
    582.31x = 372,841.64
  5. Step 5: Solve for x
    x = 372,841.64/582.31
  6. Step 6: Final answer
    x = 640.28

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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.