Home / 20,987.05-28,964.17-15,672.64

Finding the Fourth Proportional to 20,987.05, 28,964.17 and 15,672.64

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Solution

The fourth proportional to 20,987.05, 28,964.17 and 15,672.64 is: 21,629.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.05 : 28,964.17 = 15,672.64 : x
  2. Step 2: Convert to fraction form
    20,987.05/28,964.17 = 15,672.64/x
  3. Step 3: Cross multiply
    20,987.05x = 28,964.17 × 15,672.64
  4. Step 4: Simplify right side
    20,987.05x = 453,944,800.45
  5. Step 5: Solve for x
    x = 453,944,800.45/20,987.05
  6. Step 6: Final answer
    x = 21,629.76

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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.