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Finding the Fourth Proportional to 837.20, 1,253.88 and 643.28

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Solution

The fourth proportional to 837.20, 1,253.88 and 643.28 is: 963.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.20 : 1,253.88 = 643.28 : x
  2. Step 2: Convert to fraction form
    837.20/1,253.88 = 643.28/x
  3. Step 3: Cross multiply
    837.20x = 1,253.88 × 643.28
  4. Step 4: Simplify right side
    837.20x = 806,595.93
  5. Step 5: Solve for x
    x = 806,595.93/837.20
  6. Step 6: Final answer
    x = 963.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.