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Finding the Fourth Proportional to 663.14, 915.09 and 401.30

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Solution

The fourth proportional to 663.14, 915.09 and 401.30 is: 553.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.14 : 915.09 = 401.30 : x
  2. Step 2: Convert to fraction form
    663.14/915.09 = 401.30/x
  3. Step 3: Cross multiply
    663.14x = 915.09 × 401.30
  4. Step 4: Simplify right side
    663.14x = 367,225.62
  5. Step 5: Solve for x
    x = 367,225.62/663.14
  6. Step 6: Final answer
    x = 553.77

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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.