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Finding the Fourth Proportional to 961.04, 1,327.34 and 645.80

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Solution

The fourth proportional to 961.04, 1,327.34 and 645.80 is: 891.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.04 : 1,327.34 = 645.80 : x
  2. Step 2: Convert to fraction form
    961.04/1,327.34 = 645.80/x
  3. Step 3: Cross multiply
    961.04x = 1,327.34 × 645.80
  4. Step 4: Simplify right side
    961.04x = 857,196.17
  5. Step 5: Solve for x
    x = 857,196.17/961.04
  6. Step 6: Final answer
    x = 891.95

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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.