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Finding the Fourth Proportional to 881.65, 1,215.50 and 731.71

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Solution

The fourth proportional to 881.65, 1,215.50 and 731.71 is: 1,008.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.65 : 1,215.50 = 731.71 : x
  2. Step 2: Convert to fraction form
    881.65/1,215.50 = 731.71/x
  3. Step 3: Cross multiply
    881.65x = 1,215.50 × 731.71
  4. Step 4: Simplify right side
    881.65x = 889,389.85
  5. Step 5: Solve for x
    x = 889,389.85/881.65
  6. Step 6: Final answer
    x = 1,008.78

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1.5x scale

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.