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Finding the Fourth Proportional to 898.82, 1,348.38 and 638.90

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Solution

The fourth proportional to 898.82, 1,348.38 and 638.90 is: 958.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.82 : 1,348.38 = 638.90 : x
  2. Step 2: Convert to fraction form
    898.82/1,348.38 = 638.90/x
  3. Step 3: Cross multiply
    898.82x = 1,348.38 × 638.90
  4. Step 4: Simplify right side
    898.82x = 861,479.98
  5. Step 5: Solve for x
    x = 861,479.98/898.82
  6. Step 6: Final answer
    x = 958.46

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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.