Home / 20,531.20-30,748.20-13,921.60

Finding the Fourth Proportional to 20,531.20, 30,748.20 and 13,921.60

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Solution

The fourth proportional to 20,531.20, 30,748.20 and 13,921.60 is: 20,849.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,531.20 : 30,748.20 = 13,921.60 : x
  2. Step 2: Convert to fraction form
    20,531.20/30,748.20 = 13,921.60/x
  3. Step 3: Cross multiply
    20,531.20x = 30,748.20 × 13,921.60
  4. Step 4: Simplify right side
    20,531.20x = 428,064,141.12
  5. Step 5: Solve for x
    x = 428,064,141.12/20,531.20
  6. Step 6: Final answer
    x = 20,849.45

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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.