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Finding the Fourth Proportional to 961.39, 1,326.72 and 541.74

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Solution

The fourth proportional to 961.39, 1,326.72 and 541.74 is: 747.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.39 : 1,326.72 = 541.74 : x
  2. Step 2: Convert to fraction form
    961.39/1,326.72 = 541.74/x
  3. Step 3: Cross multiply
    961.39x = 1,326.72 × 541.74
  4. Step 4: Simplify right side
    961.39x = 718,737.90
  5. Step 5: Solve for x
    x = 718,737.90/961.39
  6. Step 6: Final answer
    x = 747.60

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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.