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Finding the Fourth Proportional to 2,079.64, 3,119.98 and 618.68

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Solution

The fourth proportional to 2,079.64, 3,119.98 and 618.68 is: 928.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.64 : 3,119.98 = 618.68 : x
  2. Step 2: Convert to fraction form
    2,079.64/3,119.98 = 618.68/x
  3. Step 3: Cross multiply
    2,079.64x = 3,119.98 × 618.68
  4. Step 4: Simplify right side
    2,079.64x = 1,930,269.23
  5. Step 5: Solve for x
    x = 1,930,269.23/2,079.64
  6. Step 6: Final answer
    x = 928.17

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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.