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Finding the Fourth Proportional to 422.57, 634.05 and 260.15

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Solution

The fourth proportional to 422.57, 634.05 and 260.15 is: 390.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.57 : 634.05 = 260.15 : x
  2. Step 2: Convert to fraction form
    422.57/634.05 = 260.15/x
  3. Step 3: Cross multiply
    422.57x = 634.05 × 260.15
  4. Step 4: Simplify right side
    422.57x = 164,948.11
  5. Step 5: Solve for x
    x = 164,948.11/422.57
  6. Step 6: Final answer
    x = 390.35

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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.