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Finding the Fourth Proportional to 920.22, 1,381.55 and 881.14

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Solution

The fourth proportional to 920.22, 1,381.55 and 881.14 is: 1,322.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.22 : 1,381.55 = 881.14 : x
  2. Step 2: Convert to fraction form
    920.22/1,381.55 = 881.14/x
  3. Step 3: Cross multiply
    920.22x = 1,381.55 × 881.14
  4. Step 4: Simplify right side
    920.22x = 1,217,331.11
  5. Step 5: Solve for x
    x = 1,217,331.11/920.22
  6. Step 6: Final answer
    x = 1,322.87

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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.