Home / 21,351.28-29,465.28-11,921.20

Finding the Fourth Proportional to 21,351.28, 29,465.28 and 11,921.20

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Solution

The fourth proportional to 21,351.28, 29,465.28 and 11,921.20 is: 16,451.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,351.28 : 29,465.28 = 11,921.20 : x
  2. Step 2: Convert to fraction form
    21,351.28/29,465.28 = 11,921.20/x
  3. Step 3: Cross multiply
    21,351.28x = 29,465.28 × 11,921.20
  4. Step 4: Simplify right side
    21,351.28x = 351,261,495.94
  5. Step 5: Solve for x
    x = 351,261,495.94/21,351.28
  6. Step 6: Final answer
    x = 16,451.54

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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.