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Finding the Fourth Proportional to 2,079.29, 3,118.91 and 618.39

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Solution

The fourth proportional to 2,079.29, 3,118.91 and 618.39 is: 927.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.29 : 3,118.91 = 618.39 : x
  2. Step 2: Convert to fraction form
    2,079.29/3,118.91 = 618.39/x
  3. Step 3: Cross multiply
    2,079.29x = 3,118.91 × 618.39
  4. Step 4: Simplify right side
    2,079.29x = 1,928,699.66
  5. Step 5: Solve for x
    x = 1,928,699.66/2,079.29
  6. Step 6: Final answer
    x = 927.58

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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.