Home / 20,680.40-31,009.08-18,220.88

Finding the Fourth Proportional to 20,680.40, 31,009.08 and 18,220.88

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Solution

The fourth proportional to 20,680.40, 31,009.08 and 18,220.88 is: 27,321.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.40 : 31,009.08 = 18,220.88 : x
  2. Step 2: Convert to fraction form
    20,680.40/31,009.08 = 18,220.88/x
  3. Step 3: Cross multiply
    20,680.40x = 31,009.08 × 18,220.88
  4. Step 4: Simplify right side
    20,680.40x = 565,012,725.59
  5. Step 5: Solve for x
    x = 565,012,725.59/20,680.40
  6. Step 6: Final answer
    x = 27,321.17

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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.