Home / 9,129.60-13,685.68-3,939.12

Finding the Fourth Proportional to 9,129.60, 13,685.68 and 3,939.12

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Solution

The fourth proportional to 9,129.60, 13,685.68 and 3,939.12 is: 5,904.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,129.60 : 13,685.68 = 3,939.12 : x
  2. Step 2: Convert to fraction form
    9,129.60/13,685.68 = 3,939.12/x
  3. Step 3: Cross multiply
    9,129.60x = 13,685.68 × 3,939.12
  4. Step 4: Simplify right side
    9,129.60x = 53,909,535.80
  5. Step 5: Solve for x
    x = 53,909,535.80/9,129.60
  6. Step 6: Final answer
    x = 5,904.92

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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.