Home / 8,779.24-12,123.44-5,640.90

Finding the Fourth Proportional to 8,779.24, 12,123.44 and 5,640.90

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Solution

The fourth proportional to 8,779.24, 12,123.44 and 5,640.90 is: 7,789.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,779.24 : 12,123.44 = 5,640.90 : x
  2. Step 2: Convert to fraction form
    8,779.24/12,123.44 = 5,640.90/x
  3. Step 3: Cross multiply
    8,779.24x = 12,123.44 × 5,640.90
  4. Step 4: Simplify right side
    8,779.24x = 68,387,112.70
  5. Step 5: Solve for x
    x = 68,387,112.70/8,779.24
  6. Step 6: Final answer
    x = 7,789.64

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1.5x scale

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.