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Finding the Fourth Proportional to 838.92, 1,258.38 and 656.48

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Solution

The fourth proportional to 838.92, 1,258.38 and 656.48 is: 984.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.92 : 1,258.38 = 656.48 : x
  2. Step 2: Convert to fraction form
    838.92/1,258.38 = 656.48/x
  3. Step 3: Cross multiply
    838.92x = 1,258.38 × 656.48
  4. Step 4: Simplify right side
    838.92x = 826,101.30
  5. Step 5: Solve for x
    x = 826,101.30/838.92
  6. Step 6: Final answer
    x = 984.72

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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.