Home / 1,116.15-1,540.30-618.80

Finding the Fourth Proportional to 1,116.15, 1,540.30 and 618.80

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Solution

The fourth proportional to 1,116.15, 1,540.30 and 618.80 is: 853.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.15 : 1,540.30 = 618.80 : x
  2. Step 2: Convert to fraction form
    1,116.15/1,540.30 = 618.80/x
  3. Step 3: Cross multiply
    1,116.15x = 1,540.30 × 618.80
  4. Step 4: Simplify right side
    1,116.15x = 953,129.94
  5. Step 5: Solve for x
    x = 953,129.94/1,116.15
  6. Step 6: Final answer
    x = 853.94

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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.