Home / 20,129.60-27,779.10-11,177.66

Finding the Fourth Proportional to 20,129.60, 27,779.10 and 11,177.66

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Solution

The fourth proportional to 20,129.60, 27,779.10 and 11,177.66 is: 15,425.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.60 : 27,779.10 = 11,177.66 : x
  2. Step 2: Convert to fraction form
    20,129.60/27,779.10 = 11,177.66/x
  3. Step 3: Cross multiply
    20,129.60x = 27,779.10 × 11,177.66
  4. Step 4: Simplify right side
    20,129.60x = 310,505,334.91
  5. Step 5: Solve for x
    x = 310,505,334.91/20,129.60
  6. Step 6: Final answer
    x = 15,425.31

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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.