Home / 15,917.52-21,979.44-13,278.76

Finding the Fourth Proportional to 15,917.52, 21,979.44 and 13,278.76

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Solution

The fourth proportional to 15,917.52, 21,979.44 and 13,278.76 is: 18,335.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,917.52 : 21,979.44 = 13,278.76 : x
  2. Step 2: Convert to fraction form
    15,917.52/21,979.44 = 13,278.76/x
  3. Step 3: Cross multiply
    15,917.52x = 21,979.44 × 13,278.76
  4. Step 4: Simplify right side
    15,917.52x = 291,859,708.69
  5. Step 5: Solve for x
    x = 291,859,708.69/15,917.52
  6. Step 6: Final answer
    x = 18,335.75

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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.