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Finding the Fourth Proportional to 881.29, 1,216.70 and 615.61

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Solution

The fourth proportional to 881.29, 1,216.70 and 615.61 is: 849.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.29 : 1,216.70 = 615.61 : x
  2. Step 2: Convert to fraction form
    881.29/1,216.70 = 615.61/x
  3. Step 3: Cross multiply
    881.29x = 1,216.70 × 615.61
  4. Step 4: Simplify right side
    881.29x = 749,012.69
  5. Step 5: Solve for x
    x = 749,012.69/881.29
  6. Step 6: Final answer
    x = 849.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.