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Finding the Fourth Proportional to 663.19, 915.22 and 401.21

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Solution

The fourth proportional to 663.19, 915.22 and 401.21 is: 553.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.19 : 915.22 = 401.21 : x
  2. Step 2: Convert to fraction form
    663.19/915.22 = 401.21/x
  3. Step 3: Cross multiply
    663.19x = 915.22 × 401.21
  4. Step 4: Simplify right side
    663.19x = 367,192.52
  5. Step 5: Solve for x
    x = 367,192.52/663.19
  6. Step 6: Final answer
    x = 553.67

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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.