Home / 19,919.28-27,470.88-15,720.24

Finding the Fourth Proportional to 19,919.28, 27,470.88 and 15,720.24

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Solution

The fourth proportional to 19,919.28, 27,470.88 and 15,720.24 is: 21,679.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,919.28 : 27,470.88 = 15,720.24 : x
  2. Step 2: Convert to fraction form
    19,919.28/27,470.88 = 15,720.24/x
  3. Step 3: Cross multiply
    19,919.28x = 27,470.88 × 15,720.24
  4. Step 4: Simplify right side
    19,919.28x = 431,848,826.61
  5. Step 5: Solve for x
    x = 431,848,826.61/19,919.28
  6. Step 6: Final answer
    x = 21,679.94

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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.