Home / 20,759.56-28,656.75-15,723.79

Finding the Fourth Proportional to 20,759.56, 28,656.75 and 15,723.79

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Solution

The fourth proportional to 20,759.56, 28,656.75 and 15,723.79 is: 21,705.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,759.56 : 28,656.75 = 15,723.79 : x
  2. Step 2: Convert to fraction form
    20,759.56/28,656.75 = 15,723.79/x
  3. Step 3: Cross multiply
    20,759.56x = 28,656.75 × 15,723.79
  4. Step 4: Simplify right side
    20,759.56x = 450,592,719.08
  5. Step 5: Solve for x
    x = 450,592,719.08/20,759.56
  6. Step 6: Final answer
    x = 21,705.31

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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.