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Finding the Fourth Proportional to 663, 915.42 and 488.60

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Solution

The fourth proportional to 663, 915.42 and 488.60 is: 674.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    663 : 915.42 = 488.60 : x
  2. Step 2: Convert to fraction form
    663/915.42 = 488.60/x
  3. Step 3: Cross multiply
    663x = 915.42 × 488.60
  4. Step 4: Simplify right side
    663x = 447,274.21
  5. Step 5: Solve for x
    x = 447,274.21/663
  6. Step 6: Final answer
    x = 674.62

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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.