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Finding the Fourth Proportional to 642.18, 961.65 and 397.98

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Solution

The fourth proportional to 642.18, 961.65 and 397.98 is: 595.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.18 : 961.65 = 397.98 : x
  2. Step 2: Convert to fraction form
    642.18/961.65 = 397.98/x
  3. Step 3: Cross multiply
    642.18x = 961.65 × 397.98
  4. Step 4: Simplify right side
    642.18x = 382,717.47
  5. Step 5: Solve for x
    x = 382,717.47/642.18
  6. Step 6: Final answer
    x = 595.97

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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.