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Finding the Fourth Proportional to 461.80, 635.82 and 391.71

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Solution

The fourth proportional to 461.80, 635.82 and 391.71 is: 539.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.80 : 635.82 = 391.71 : x
  2. Step 2: Convert to fraction form
    461.80/635.82 = 391.71/x
  3. Step 3: Cross multiply
    461.80x = 635.82 × 391.71
  4. Step 4: Simplify right side
    461.80x = 249,057.05
  5. Step 5: Solve for x
    x = 249,057.05/461.80
  6. Step 6: Final answer
    x = 539.32

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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.