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Finding the Fourth Proportional to 881.69, 1,321.92 and 491.77

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Solution

The fourth proportional to 881.69, 1,321.92 and 491.77 is: 737.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.69 : 1,321.92 = 491.77 : x
  2. Step 2: Convert to fraction form
    881.69/1,321.92 = 491.77/x
  3. Step 3: Cross multiply
    881.69x = 1,321.92 × 491.77
  4. Step 4: Simplify right side
    881.69x = 650,082.25
  5. Step 5: Solve for x
    x = 650,082.25/881.69
  6. Step 6: Final answer
    x = 737.32

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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.