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Finding the Fourth Proportional to 891.91, 1,231.22 and 670.91

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Solution

The fourth proportional to 891.91, 1,231.22 and 670.91 is: 926.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.91 : 1,231.22 = 670.91 : x
  2. Step 2: Convert to fraction form
    891.91/1,231.22 = 670.91/x
  3. Step 3: Cross multiply
    891.91x = 1,231.22 × 670.91
  4. Step 4: Simplify right side
    891.91x = 826,034.46
  5. Step 5: Solve for x
    x = 826,034.46/891.91
  6. Step 6: Final answer
    x = 926.15

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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.