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Finding the Fourth Proportional to 2,079.60, 3,118.49 and 780.16

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Solution

The fourth proportional to 2,079.60, 3,118.49 and 780.16 is: 1,169.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.60 : 3,118.49 = 780.16 : x
  2. Step 2: Convert to fraction form
    2,079.60/3,118.49 = 780.16/x
  3. Step 3: Cross multiply
    2,079.60x = 3,118.49 × 780.16
  4. Step 4: Simplify right side
    2,079.60x = 2,432,921.16
  5. Step 5: Solve for x
    x = 2,432,921.16/2,079.60
  6. Step 6: Final answer
    x = 1,169.90

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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.