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Finding the Fourth Proportional to 489.18, 733.11 and 431.28

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Solution

The fourth proportional to 489.18, 733.11 and 431.28 is: 646.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.18 : 733.11 = 431.28 : x
  2. Step 2: Convert to fraction form
    489.18/733.11 = 431.28/x
  3. Step 3: Cross multiply
    489.18x = 733.11 × 431.28
  4. Step 4: Simplify right side
    489.18x = 316,175.68
  5. Step 5: Solve for x
    x = 316,175.68/489.18
  6. Step 6: Final answer
    x = 646.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.