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Finding the Fourth Proportional to 487.31, 730.56 and 281.57

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Solution

The fourth proportional to 487.31, 730.56 and 281.57 is: 422.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.31 : 730.56 = 281.57 : x
  2. Step 2: Convert to fraction form
    487.31/730.56 = 281.57/x
  3. Step 3: Cross multiply
    487.31x = 730.56 × 281.57
  4. Step 4: Simplify right side
    487.31x = 205,703.78
  5. Step 5: Solve for x
    x = 205,703.78/487.31
  6. Step 6: Final answer
    x = 422.12

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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.