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Finding the Fourth Proportional to 930.75, 1,286.84 and 889.95

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Solution

The fourth proportional to 930.75, 1,286.84 and 889.95 is: 1,230.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.75 : 1,286.84 = 889.95 : x
  2. Step 2: Convert to fraction form
    930.75/1,286.84 = 889.95/x
  3. Step 3: Cross multiply
    930.75x = 1,286.84 × 889.95
  4. Step 4: Simplify right side
    930.75x = 1,145,218.81
  5. Step 5: Solve for x
    x = 1,145,218.81/930.75
  6. Step 6: Final answer
    x = 1,230.43

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1.5x scale

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.