Home / 21,161.28-28,987.20-20,928

Finding the Fourth Proportional to 21,161.28, 28,987.20 and 20,928

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Solution

The fourth proportional to 21,161.28, 28,987.20 and 20,928 is: 28,667.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,161.28 : 28,987.20 = 20,928 : x
  2. Step 2: Convert to fraction form
    21,161.28/28,987.20 = 20,928/x
  3. Step 3: Cross multiply
    21,161.28x = 28,987.20 × 20,928
  4. Step 4: Simplify right side
    21,161.28x = 606,644,121.60
  5. Step 5: Solve for x
    x = 606,644,121.60/21,161.28
  6. Step 6: Final answer
    x = 28,667.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.