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Finding the Fourth Proportional to 2,079.36, 3,119.04 and 780.12

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Solution

The fourth proportional to 2,079.36, 3,119.04 and 780.12 is: 1,170.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.36 : 3,119.04 = 780.12 : x
  2. Step 2: Convert to fraction form
    2,079.36/3,119.04 = 780.12/x
  3. Step 3: Cross multiply
    2,079.36x = 3,119.04 × 780.12
  4. Step 4: Simplify right side
    2,079.36x = 2,433,225.48
  5. Step 5: Solve for x
    x = 2,433,225.48/2,079.36
  6. Step 6: Final answer
    x = 1,170.18

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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.