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Finding the Fourth Proportional to 891.89, 1,338.08 and 642.03

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Solution

The fourth proportional to 891.89, 1,338.08 and 642.03 is: 963.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.89 : 1,338.08 = 642.03 : x
  2. Step 2: Convert to fraction form
    891.89/1,338.08 = 642.03/x
  3. Step 3: Cross multiply
    891.89x = 1,338.08 × 642.03
  4. Step 4: Simplify right side
    891.89x = 859,079.27
  5. Step 5: Solve for x
    x = 859,079.27/891.89
  6. Step 6: Final answer
    x = 963.21

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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.