Home / 21,987.28-30,315.72-15,278.48

Finding the Fourth Proportional to 21,987.28, 30,315.72 and 15,278.48

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Solution

The fourth proportional to 21,987.28, 30,315.72 and 15,278.48 is: 21,065.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.28 : 30,315.72 = 15,278.48 : x
  2. Step 2: Convert to fraction form
    21,987.28/30,315.72 = 15,278.48/x
  3. Step 3: Cross multiply
    21,987.28x = 30,315.72 × 15,278.48
  4. Step 4: Simplify right side
    21,987.28x = 463,178,121.71
  5. Step 5: Solve for x
    x = 463,178,121.71/21,987.28
  6. Step 6: Final answer
    x = 21,065.73

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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.