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Finding the Fourth Proportional to 985.66, 1,471.26 and 868.88

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Solution

The fourth proportional to 985.66, 1,471.26 and 868.88 is: 1,296.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.66 : 1,471.26 = 868.88 : x
  2. Step 2: Convert to fraction form
    985.66/1,471.26 = 868.88/x
  3. Step 3: Cross multiply
    985.66x = 1,471.26 × 868.88
  4. Step 4: Simplify right side
    985.66x = 1,278,347.05
  5. Step 5: Solve for x
    x = 1,278,347.05/985.66
  6. Step 6: Final answer
    x = 1,296.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.