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Finding the Fourth Proportional to 663.28, 915.36 and 427.36

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Solution

The fourth proportional to 663.28, 915.36 and 427.36 is: 589.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.28 : 915.36 = 427.36 : x
  2. Step 2: Convert to fraction form
    663.28/915.36 = 427.36/x
  3. Step 3: Cross multiply
    663.28x = 915.36 × 427.36
  4. Step 4: Simplify right side
    663.28x = 391,188.25
  5. Step 5: Solve for x
    x = 391,188.25/663.28
  6. Step 6: Final answer
    x = 589.78

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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.