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Finding the Fourth Proportional to 891.95, 1,338.12 and 618.17

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Solution

The fourth proportional to 891.95, 1,338.12 and 618.17 is: 927.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.95 : 1,338.12 = 618.17 : x
  2. Step 2: Convert to fraction form
    891.95/1,338.12 = 618.17/x
  3. Step 3: Cross multiply
    891.95x = 1,338.12 × 618.17
  4. Step 4: Simplify right side
    891.95x = 827,178.95
  5. Step 5: Solve for x
    x = 827,178.95/891.95
  6. Step 6: Final answer
    x = 927.39

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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.