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Finding the Fourth Proportional to 1,096.85, 1,646.57 and 865.90

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Solution

The fourth proportional to 1,096.85, 1,646.57 and 865.90 is: 1,299.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,096.85 : 1,646.57 = 865.90 : x
  2. Step 2: Convert to fraction form
    1,096.85/1,646.57 = 865.90/x
  3. Step 3: Cross multiply
    1,096.85x = 1,646.57 × 865.90
  4. Step 4: Simplify right side
    1,096.85x = 1,425,756.52
  5. Step 5: Solve for x
    x = 1,425,756.52/1,096.85
  6. Step 6: Final answer
    x = 1,299.86

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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.