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Finding the Fourth Proportional to 985.87, 1,480.20 and 865.59

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Solution

The fourth proportional to 985.87, 1,480.20 and 865.59 is: 1,299.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.87 : 1,480.20 = 865.59 : x
  2. Step 2: Convert to fraction form
    985.87/1,480.20 = 865.59/x
  3. Step 3: Cross multiply
    985.87x = 1,480.20 × 865.59
  4. Step 4: Simplify right side
    985.87x = 1,281,246.32
  5. Step 5: Solve for x
    x = 1,281,246.32/985.87
  6. Step 6: Final answer
    x = 1,299.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.