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Finding the Fourth Proportional to 1,348.20, 2,019.78 and 769.32

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Solution

The fourth proportional to 1,348.20, 2,019.78 and 769.32 is: 1,152.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,348.20 : 2,019.78 = 769.32 : x
  2. Step 2: Convert to fraction form
    1,348.20/2,019.78 = 769.32/x
  3. Step 3: Cross multiply
    1,348.20x = 2,019.78 × 769.32
  4. Step 4: Simplify right side
    1,348.20x = 1,553,857.15
  5. Step 5: Solve for x
    x = 1,553,857.15/1,348.20
  6. Step 6: Final answer
    x = 1,152.54

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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.