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Finding the Fourth Proportional to 891.68, 1,338.03 and 480.81

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Solution

The fourth proportional to 891.68, 1,338.03 and 480.81 is: 721.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.68 : 1,338.03 = 480.81 : x
  2. Step 2: Convert to fraction form
    891.68/1,338.03 = 480.81/x
  3. Step 3: Cross multiply
    891.68x = 1,338.03 × 480.81
  4. Step 4: Simplify right side
    891.68x = 643,338.20
  5. Step 5: Solve for x
    x = 643,338.20/891.68
  6. Step 6: Final answer
    x = 721.49

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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.