Home / 20,999.84-28,979.94-11,439.92

Finding the Fourth Proportional to 20,999.84, 28,979.94 and 11,439.92

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Solution

The fourth proportional to 20,999.84, 28,979.94 and 11,439.92 is: 15,787.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.84 : 28,979.94 = 11,439.92 : x
  2. Step 2: Convert to fraction form
    20,999.84/28,979.94 = 11,439.92/x
  3. Step 3: Cross multiply
    20,999.84x = 28,979.94 × 11,439.92
  4. Step 4: Simplify right side
    20,999.84x = 331,528,195.20
  5. Step 5: Solve for x
    x = 331,528,195.20/20,999.84
  6. Step 6: Final answer
    x = 15,787.18

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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.