Home / 1,218.80-1,681.38-1,079.06

Finding the Fourth Proportional to 1,218.80, 1,681.38 and 1,079.06

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Solution

The fourth proportional to 1,218.80, 1,681.38 and 1,079.06 is: 1,488.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.80 : 1,681.38 = 1,079.06 : x
  2. Step 2: Convert to fraction form
    1,218.80/1,681.38 = 1,079.06/x
  3. Step 3: Cross multiply
    1,218.80x = 1,681.38 × 1,079.06
  4. Step 4: Simplify right side
    1,218.80x = 1,814,309.90
  5. Step 5: Solve for x
    x = 1,814,309.90/1,218.80
  6. Step 6: Final answer
    x = 1,488.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.