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Finding the Fourth Proportional to 881.46, 1,217.15 and 619.63

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Solution

The fourth proportional to 881.46, 1,217.15 and 619.63 is: 855.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.46 : 1,217.15 = 619.63 : x
  2. Step 2: Convert to fraction form
    881.46/1,217.15 = 619.63/x
  3. Step 3: Cross multiply
    881.46x = 1,217.15 × 619.63
  4. Step 4: Simplify right side
    881.46x = 754,182.65
  5. Step 5: Solve for x
    x = 754,182.65/881.46
  6. Step 6: Final answer
    x = 855.61

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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.