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Finding the Fourth Proportional to 422.40, 632.88 and 314.16

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Solution

The fourth proportional to 422.40, 632.88 and 314.16 is: 470.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.40 : 632.88 = 314.16 : x
  2. Step 2: Convert to fraction form
    422.40/632.88 = 314.16/x
  3. Step 3: Cross multiply
    422.40x = 632.88 × 314.16
  4. Step 4: Simplify right side
    422.40x = 198,825.58
  5. Step 5: Solve for x
    x = 198,825.58/422.40
  6. Step 6: Final answer
    x = 470.70

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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.