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Finding the Fourth Proportional to 986.80, 1,471.25 and 961.15

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Solution

The fourth proportional to 986.80, 1,471.25 and 961.15 is: 1,433.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.80 : 1,471.25 = 961.15 : x
  2. Step 2: Convert to fraction form
    986.80/1,471.25 = 961.15/x
  3. Step 3: Cross multiply
    986.80x = 1,471.25 × 961.15
  4. Step 4: Simplify right side
    986.80x = 1,414,091.94
  5. Step 5: Solve for x
    x = 1,414,091.94/986.80
  6. Step 6: Final answer
    x = 1,433.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.