Home / 18,921.84-28,353.56-11,981.76

Finding the Fourth Proportional to 18,921.84, 28,353.56 and 11,981.76

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Solution

The fourth proportional to 18,921.84, 28,353.56 and 11,981.76 is: 17,954.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.84 : 28,353.56 = 11,981.76 : x
  2. Step 2: Convert to fraction form
    18,921.84/28,353.56 = 11,981.76/x
  3. Step 3: Cross multiply
    18,921.84x = 28,353.56 × 11,981.76
  4. Step 4: Simplify right side
    18,921.84x = 339,725,551.07
  5. Step 5: Solve for x
    x = 339,725,551.07/18,921.84
  6. Step 6: Final answer
    x = 17,954.15

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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.