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Finding the Fourth Proportional to 663.11, 915.51 and 427.17

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Solution

The fourth proportional to 663.11, 915.51 and 427.17 is: 589.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.11 : 915.51 = 427.17 : x
  2. Step 2: Convert to fraction form
    663.11/915.51 = 427.17/x
  3. Step 3: Cross multiply
    663.11x = 915.51 × 427.17
  4. Step 4: Simplify right side
    663.11x = 391,078.41
  5. Step 5: Solve for x
    x = 391,078.41/663.11
  6. Step 6: Final answer
    x = 589.76

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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.