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Finding the Fourth Proportional to 865.99, 1,194.31 and 688.75

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Solution

The fourth proportional to 865.99, 1,194.31 and 688.75 is: 949.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    865.99 : 1,194.31 = 688.75 : x
  2. Step 2: Convert to fraction form
    865.99/1,194.31 = 688.75/x
  3. Step 3: Cross multiply
    865.99x = 1,194.31 × 688.75
  4. Step 4: Simplify right side
    865.99x = 822,582.70
  5. Step 5: Solve for x
    x = 822,582.70/865.99
  6. Step 6: Final answer
    x = 949.87

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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.