Home / 20,820.28-31,230.46-5,237.80

Finding the Fourth Proportional to 20,820.28, 31,230.46 and 5,237.80

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Solution

The fourth proportional to 20,820.28, 31,230.46 and 5,237.80 is: 7,856.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.28 : 31,230.46 = 5,237.80 : x
  2. Step 2: Convert to fraction form
    20,820.28/31,230.46 = 5,237.80/x
  3. Step 3: Cross multiply
    20,820.28x = 31,230.46 × 5,237.80
  4. Step 4: Simplify right side
    20,820.28x = 163,578,903.39
  5. Step 5: Solve for x
    x = 163,578,903.39/20,820.28
  6. Step 6: Final answer
    x = 7,856.71

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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.