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Finding the Fourth Proportional to 881.13, 1,320.96 and 555.78

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Solution

The fourth proportional to 881.13, 1,320.96 and 555.78 is: 833.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.13 : 1,320.96 = 555.78 : x
  2. Step 2: Convert to fraction form
    881.13/1,320.96 = 555.78/x
  3. Step 3: Cross multiply
    881.13x = 1,320.96 × 555.78
  4. Step 4: Simplify right side
    881.13x = 734,163.15
  5. Step 5: Solve for x
    x = 734,163.15/881.13
  6. Step 6: Final answer
    x = 833.21

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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.