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Finding the Fourth Proportional to 663.03, 915.12 and 401.09

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Solution

The fourth proportional to 663.03, 915.12 and 401.09 is: 553.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.03 : 915.12 = 401.09 : x
  2. Step 2: Convert to fraction form
    663.03/915.12 = 401.09/x
  3. Step 3: Cross multiply
    663.03x = 915.12 × 401.09
  4. Step 4: Simplify right side
    663.03x = 367,040.91
  5. Step 5: Solve for x
    x = 367,040.91/663.03
  6. Step 6: Final answer
    x = 553.58

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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.