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Finding the Fourth Proportional to 1,299.85, 1,791.18 and 1,103.02

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Solution

The fourth proportional to 1,299.85, 1,791.18 and 1,103.02 is: 1,519.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.85 : 1,791.18 = 1,103.02 : x
  2. Step 2: Convert to fraction form
    1,299.85/1,791.18 = 1,103.02/x
  3. Step 3: Cross multiply
    1,299.85x = 1,791.18 × 1,103.02
  4. Step 4: Simplify right side
    1,299.85x = 1,975,702.89
  5. Step 5: Solve for x
    x = 1,975,702.89/1,299.85
  6. Step 6: Final answer
    x = 1,519.95

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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.