Home / 1,288.12-1,779.16-1,115.60

Finding the Fourth Proportional to 1,288.12, 1,779.16 and 1,115.60

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Solution

The fourth proportional to 1,288.12, 1,779.16 and 1,115.60 is: 1,540.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.12 : 1,779.16 = 1,115.60 : x
  2. Step 2: Convert to fraction form
    1,288.12/1,779.16 = 1,115.60/x
  3. Step 3: Cross multiply
    1,288.12x = 1,779.16 × 1,115.60
  4. Step 4: Simplify right side
    1,288.12x = 1,984,830.90
  5. Step 5: Solve for x
    x = 1,984,830.90/1,288.12
  6. Step 6: Final answer
    x = 1,540.87

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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.