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Finding the Fourth Proportional to 887.32, 1,223.94 and 638.92

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Solution

The fourth proportional to 887.32, 1,223.94 and 638.92 is: 881.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.32 : 1,223.94 = 638.92 : x
  2. Step 2: Convert to fraction form
    887.32/1,223.94 = 638.92/x
  3. Step 3: Cross multiply
    887.32x = 1,223.94 × 638.92
  4. Step 4: Simplify right side
    887.32x = 781,999.74
  5. Step 5: Solve for x
    x = 781,999.74/887.32
  6. Step 6: Final answer
    x = 881.31

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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.