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Finding the Fourth Proportional to 461.28, 690.38 and 314.43

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Solution

The fourth proportional to 461.28, 690.38 and 314.43 is: 470.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.28 : 690.38 = 314.43 : x
  2. Step 2: Convert to fraction form
    461.28/690.38 = 314.43/x
  3. Step 3: Cross multiply
    461.28x = 690.38 × 314.43
  4. Step 4: Simplify right side
    461.28x = 217,073.20
  5. Step 5: Solve for x
    x = 217,073.20/461.28
  6. Step 6: Final answer
    x = 470.58

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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.