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Finding the Fourth Proportional to 912.09, 1,366.20 and 871.95

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Solution

The fourth proportional to 912.09, 1,366.20 and 871.95 is: 1,306.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.09 : 1,366.20 = 871.95 : x
  2. Step 2: Convert to fraction form
    912.09/1,366.20 = 871.95/x
  3. Step 3: Cross multiply
    912.09x = 1,366.20 × 871.95
  4. Step 4: Simplify right side
    912.09x = 1,191,258.09
  5. Step 5: Solve for x
    x = 1,191,258.09/912.09
  6. Step 6: Final answer
    x = 1,306.08

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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.