Home / 20,820.13-31,230.21-5,237.75

Finding the Fourth Proportional to 20,820.13, 31,230.21 and 5,237.75

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Solution

The fourth proportional to 20,820.13, 31,230.21 and 5,237.75 is: 7,856.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.13 : 31,230.21 = 5,237.75 : x
  2. Step 2: Convert to fraction form
    20,820.13/31,230.21 = 5,237.75/x
  3. Step 3: Cross multiply
    20,820.13x = 31,230.21 × 5,237.75
  4. Step 4: Simplify right side
    20,820.13x = 163,576,032.43
  5. Step 5: Solve for x
    x = 163,576,032.43/20,820.13
  6. Step 6: Final answer
    x = 7,856.63

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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.