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Finding the Fourth Proportional to 963.70, 1,330.05 and 838.90

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Solution

The fourth proportional to 963.70, 1,330.05 and 838.90 is: 1,157.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.70 : 1,330.05 = 838.90 : x
  2. Step 2: Convert to fraction form
    963.70/1,330.05 = 838.90/x
  3. Step 3: Cross multiply
    963.70x = 1,330.05 × 838.90
  4. Step 4: Simplify right side
    963.70x = 1,115,778.95
  5. Step 5: Solve for x
    x = 1,115,778.95/963.70
  6. Step 6: Final answer
    x = 1,157.81

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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.