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Finding the Fourth Proportional to 642.03, 961.77 and 422.46

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Solution

The fourth proportional to 642.03, 961.77 and 422.46 is: 632.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.03 : 961.77 = 422.46 : x
  2. Step 2: Convert to fraction form
    642.03/961.77 = 422.46/x
  3. Step 3: Cross multiply
    642.03x = 961.77 × 422.46
  4. Step 4: Simplify right side
    642.03x = 406,309.35
  5. Step 5: Solve for x
    x = 406,309.35/642.03
  6. Step 6: Final answer
    x = 632.85

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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.