Home / 10,779.20-16,149.60-8,820.80

Finding the Fourth Proportional to 10,779.20, 16,149.60 and 8,820.80

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Solution

The fourth proportional to 10,779.20, 16,149.60 and 8,820.80 is: 13,215.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,779.20 : 16,149.60 = 8,820.80 : x
  2. Step 2: Convert to fraction form
    10,779.20/16,149.60 = 8,820.80/x
  3. Step 3: Cross multiply
    10,779.20x = 16,149.60 × 8,820.80
  4. Step 4: Simplify right side
    10,779.20x = 142,452,391.68
  5. Step 5: Solve for x
    x = 142,452,391.68/10,779.20
  6. Step 6: Final answer
    x = 13,215.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.