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Finding the Fourth Proportional to 663.88, 915.60 and 576.40

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Solution

The fourth proportional to 663.88, 915.60 and 576.40 is: 794.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.88 : 915.60 = 576.40 : x
  2. Step 2: Convert to fraction form
    663.88/915.60 = 576.40/x
  3. Step 3: Cross multiply
    663.88x = 915.60 × 576.40
  4. Step 4: Simplify right side
    663.88x = 527,751.84
  5. Step 5: Solve for x
    x = 527,751.84/663.88
  6. Step 6: Final answer
    x = 794.95

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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.