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Finding the Fourth Proportional to 891.86, 1,338.28 and 372.22

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Solution

The fourth proportional to 891.86, 1,338.28 and 372.22 is: 558.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.86 : 1,338.28 = 372.22 : x
  2. Step 2: Convert to fraction form
    891.86/1,338.28 = 372.22/x
  3. Step 3: Cross multiply
    891.86x = 1,338.28 × 372.22
  4. Step 4: Simplify right side
    891.86x = 498,134.58
  5. Step 5: Solve for x
    x = 498,134.58/891.86
  6. Step 6: Final answer
    x = 558.53

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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.