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Finding the Fourth Proportional to 1,339.20, 2,005.20 and 849.60

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Solution

The fourth proportional to 1,339.20, 2,005.20 and 849.60 is: 1,272.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.20 : 2,005.20 = 849.60 : x
  2. Step 2: Convert to fraction form
    1,339.20/2,005.20 = 849.60/x
  3. Step 3: Cross multiply
    1,339.20x = 2,005.20 × 849.60
  4. Step 4: Simplify right side
    1,339.20x = 1,703,617.92
  5. Step 5: Solve for x
    x = 1,703,617.92/1,339.20
  6. Step 6: Final answer
    x = 1,272.12

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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.