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Finding the Fourth Proportional to 663.64, 915.54 and 439.82

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Solution

The fourth proportional to 663.64, 915.54 and 439.82 is: 606.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.64 : 915.54 = 439.82 : x
  2. Step 2: Convert to fraction form
    663.64/915.54 = 439.82/x
  3. Step 3: Cross multiply
    663.64x = 915.54 × 439.82
  4. Step 4: Simplify right side
    663.64x = 402,672.80
  5. Step 5: Solve for x
    x = 402,672.80/663.64
  6. Step 6: Final answer
    x = 606.76

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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.