Home / 20,912.28-31,365.18-6,117.72

Finding the Fourth Proportional to 20,912.28, 31,365.18 and 6,117.72

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Solution

The fourth proportional to 20,912.28, 31,365.18 and 6,117.72 is: 9,175.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.28 : 31,365.18 = 6,117.72 : x
  2. Step 2: Convert to fraction form
    20,912.28/31,365.18 = 6,117.72/x
  3. Step 3: Cross multiply
    20,912.28x = 31,365.18 × 6,117.72
  4. Step 4: Simplify right side
    20,912.28x = 191,883,388.99
  5. Step 5: Solve for x
    x = 191,883,388.99/20,912.28
  6. Step 6: Final answer
    x = 9,175.63

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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.