Home / 1,116.10-1,540.31-618.90

Finding the Fourth Proportional to 1,116.10, 1,540.31 and 618.90

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Solution

The fourth proportional to 1,116.10, 1,540.31 and 618.90 is: 854.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.10 : 1,540.31 = 618.90 : x
  2. Step 2: Convert to fraction form
    1,116.10/1,540.31 = 618.90/x
  3. Step 3: Cross multiply
    1,116.10x = 1,540.31 × 618.90
  4. Step 4: Simplify right side
    1,116.10x = 953,297.86
  5. Step 5: Solve for x
    x = 953,297.86/1,116.10
  6. Step 6: Final answer
    x = 854.13

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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.