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Finding the Fourth Proportional to 663.26, 915.70 and 427.61

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Solution

The fourth proportional to 663.26, 915.70 and 427.61 is: 590.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.26 : 915.70 = 427.61 : x
  2. Step 2: Convert to fraction form
    663.26/915.70 = 427.61/x
  3. Step 3: Cross multiply
    663.26x = 915.70 × 427.61
  4. Step 4: Simplify right side
    663.26x = 391,562.48
  5. Step 5: Solve for x
    x = 391,562.48/663.26
  6. Step 6: Final answer
    x = 590.36

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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.