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Finding the Fourth Proportional to 887.82, 1,223.46 and 638.70

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Solution

The fourth proportional to 887.82, 1,223.46 and 638.70 is: 880.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.82 : 1,223.46 = 638.70 : x
  2. Step 2: Convert to fraction form
    887.82/1,223.46 = 638.70/x
  3. Step 3: Cross multiply
    887.82x = 1,223.46 × 638.70
  4. Step 4: Simplify right side
    887.82x = 781,423.90
  5. Step 5: Solve for x
    x = 781,423.90/887.82
  6. Step 6: Final answer
    x = 880.16

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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.