Home / 20,318.40-28,039.20-11,365.80

Finding the Fourth Proportional to 20,318.40, 28,039.20 and 11,365.80

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Solution

The fourth proportional to 20,318.40, 28,039.20 and 11,365.80 is: 15,684.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,318.40 : 28,039.20 = 11,365.80 : x
  2. Step 2: Convert to fraction form
    20,318.40/28,039.20 = 11,365.80/x
  3. Step 3: Cross multiply
    20,318.40x = 28,039.20 × 11,365.80
  4. Step 4: Simplify right side
    20,318.40x = 318,687,939.36
  5. Step 5: Solve for x
    x = 318,687,939.36/20,318.40
  6. Step 6: Final answer
    x = 15,684.70

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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.