Home / 20,987.79-28,990.76-15,673.38

Finding the Fourth Proportional to 20,987.79, 28,990.76 and 15,673.38

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Solution

The fourth proportional to 20,987.79, 28,990.76 and 15,673.38 is: 21,649.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.79 : 28,990.76 = 15,673.38 : x
  2. Step 2: Convert to fraction form
    20,987.79/28,990.76 = 15,673.38/x
  3. Step 3: Cross multiply
    20,987.79x = 28,990.76 × 15,673.38
  4. Step 4: Simplify right side
    20,987.79x = 454,383,119.60
  5. Step 5: Solve for x
    x = 454,383,119.60/20,987.79
  6. Step 6: Final answer
    x = 21,649.88

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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.