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Finding the Fourth Proportional to 886.77, 1,223.88 and 638.91

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Solution

The fourth proportional to 886.77, 1,223.88 and 638.91 is: 881.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.77 : 1,223.88 = 638.91 : x
  2. Step 2: Convert to fraction form
    886.77/1,223.88 = 638.91/x
  3. Step 3: Cross multiply
    886.77x = 1,223.88 × 638.91
  4. Step 4: Simplify right side
    886.77x = 781,949.17
  5. Step 5: Solve for x
    x = 781,949.17/886.77
  6. Step 6: Final answer
    x = 881.79

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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.