Home / 19,881-27,434.79-11,921.67

Finding the Fourth Proportional to 19,881, 27,434.79 and 11,921.67

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Solution

The fourth proportional to 19,881, 27,434.79 and 11,921.67 is: 16,451.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,881 : 27,434.79 = 11,921.67 : x
  2. Step 2: Convert to fraction form
    19,881/27,434.79 = 11,921.67/x
  3. Step 3: Cross multiply
    19,881x = 27,434.79 × 11,921.67
  4. Step 4: Simplify right side
    19,881x = 327,068,512.90
  5. Step 5: Solve for x
    x = 327,068,512.90/19,881
  6. Step 6: Final answer
    x = 16,451.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.