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Finding the Fourth Proportional to 663.75, 915.98 and 431.01

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Solution

The fourth proportional to 663.75, 915.98 and 431.01 is: 594.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.75 : 915.98 = 431.01 : x
  2. Step 2: Convert to fraction form
    663.75/915.98 = 431.01/x
  3. Step 3: Cross multiply
    663.75x = 915.98 × 431.01
  4. Step 4: Simplify right side
    663.75x = 394,794.38
  5. Step 5: Solve for x
    x = 394,794.38/663.75
  6. Step 6: Final answer
    x = 594.79

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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.