Home / 20,387.28-28,150.36-13,220.60

Finding the Fourth Proportional to 20,387.28, 28,150.36 and 13,220.60

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Solution

The fourth proportional to 20,387.28, 28,150.36 and 13,220.60 is: 18,254.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.28 : 28,150.36 = 13,220.60 : x
  2. Step 2: Convert to fraction form
    20,387.28/28,150.36 = 13,220.60/x
  3. Step 3: Cross multiply
    20,387.28x = 28,150.36 × 13,220.60
  4. Step 4: Simplify right side
    20,387.28x = 372,164,649.42
  5. Step 5: Solve for x
    x = 372,164,649.42/20,387.28
  6. Step 6: Final answer
    x = 18,254.75

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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.