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Finding the Fourth Proportional to 2,079.66, 3,120 and 618.80

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Solution

The fourth proportional to 2,079.66, 3,120 and 618.80 is: 928.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.66 : 3,120 = 618.80 : x
  2. Step 2: Convert to fraction form
    2,079.66/3,120 = 618.80/x
  3. Step 3: Cross multiply
    2,079.66x = 3,120 × 618.80
  4. Step 4: Simplify right side
    2,079.66x = 1,930,656.00
  5. Step 5: Solve for x
    x = 1,930,656.00/2,079.66
  6. Step 6: Final answer
    x = 928.35

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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.