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Finding the Fourth Proportional to 886.73, 1,223.81 and 631.61

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Solution

The fourth proportional to 886.73, 1,223.81 and 631.61 is: 871.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.73 : 1,223.81 = 631.61 : x
  2. Step 2: Convert to fraction form
    886.73/1,223.81 = 631.61/x
  3. Step 3: Cross multiply
    886.73x = 1,223.81 × 631.61
  4. Step 4: Simplify right side
    886.73x = 772,966.09
  5. Step 5: Solve for x
    x = 772,966.09/886.73
  6. Step 6: Final answer
    x = 871.71

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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.