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Finding the Fourth Proportional to 663.04, 915.09 and 401.08

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Solution

The fourth proportional to 663.04, 915.09 and 401.08 is: 553.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.04 : 915.09 = 401.08 : x
  2. Step 2: Convert to fraction form
    663.04/915.09 = 401.08/x
  3. Step 3: Cross multiply
    663.04x = 915.09 × 401.08
  4. Step 4: Simplify right side
    663.04x = 367,024.30
  5. Step 5: Solve for x
    x = 367,024.30/663.04
  6. Step 6: Final answer
    x = 553.55

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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.