Home / 20,487.76-30,729.20-7,158.60

Finding the Fourth Proportional to 20,487.76, 30,729.20 and 7,158.60

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Solution

The fourth proportional to 20,487.76, 30,729.20 and 7,158.60 is: 10,737.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.76 : 30,729.20 = 7,158.60 : x
  2. Step 2: Convert to fraction form
    20,487.76/30,729.20 = 7,158.60/x
  3. Step 3: Cross multiply
    20,487.76x = 30,729.20 × 7,158.60
  4. Step 4: Simplify right side
    20,487.76x = 219,978,015.33
  5. Step 5: Solve for x
    x = 219,978,015.33/20,487.76
  6. Step 6: Final answer
    x = 10,737.05

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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.