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Finding the Fourth Proportional to 961.18, 1,326.40 and 628.98

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Solution

The fourth proportional to 961.18, 1,326.40 and 628.98 is: 867.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.18 : 1,326.40 = 628.98 : x
  2. Step 2: Convert to fraction form
    961.18/1,326.40 = 628.98/x
  3. Step 3: Cross multiply
    961.18x = 1,326.40 × 628.98
  4. Step 4: Simplify right side
    961.18x = 834,279.07
  5. Step 5: Solve for x
    x = 834,279.07/961.18
  6. Step 6: Final answer
    x = 867.97

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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.