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Finding the Fourth Proportional to 1,079.87, 1,620.62 and 866.03

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Solution

The fourth proportional to 1,079.87, 1,620.62 and 866.03 is: 1,299.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.87 : 1,620.62 = 866.03 : x
  2. Step 2: Convert to fraction form
    1,079.87/1,620.62 = 866.03/x
  3. Step 3: Cross multiply
    1,079.87x = 1,620.62 × 866.03
  4. Step 4: Simplify right side
    1,079.87x = 1,403,505.54
  5. Step 5: Solve for x
    x = 1,403,505.54/1,079.87
  6. Step 6: Final answer
    x = 1,299.70

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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.