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Finding the Fourth Proportional to 939.87, 1,298.34 and 855.70

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Solution

The fourth proportional to 939.87, 1,298.34 and 855.70 is: 1,182.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.87 : 1,298.34 = 855.70 : x
  2. Step 2: Convert to fraction form
    939.87/1,298.34 = 855.70/x
  3. Step 3: Cross multiply
    939.87x = 1,298.34 × 855.70
  4. Step 4: Simplify right side
    939.87x = 1,110,989.54
  5. Step 5: Solve for x
    x = 1,110,989.54/939.87
  6. Step 6: Final answer
    x = 1,182.07

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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.