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Finding the Fourth Proportional to 912.05, 1,366.92 and 391.44

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Solution

The fourth proportional to 912.05, 1,366.92 and 391.44 is: 586.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.05 : 1,366.92 = 391.44 : x
  2. Step 2: Convert to fraction form
    912.05/1,366.92 = 391.44/x
  3. Step 3: Cross multiply
    912.05x = 1,366.92 × 391.44
  4. Step 4: Simplify right side
    912.05x = 535,067.16
  5. Step 5: Solve for x
    x = 535,067.16/912.05
  6. Step 6: Final answer
    x = 586.66

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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.