Home / 20,718.88-31,028.40-12,917.92

Finding the Fourth Proportional to 20,718.88, 31,028.40 and 12,917.92

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Solution

The fourth proportional to 20,718.88, 31,028.40 and 12,917.92 is: 19,345.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,718.88 : 31,028.40 = 12,917.92 : x
  2. Step 2: Convert to fraction form
    20,718.88/31,028.40 = 12,917.92/x
  3. Step 3: Cross multiply
    20,718.88x = 31,028.40 × 12,917.92
  4. Step 4: Simplify right side
    20,718.88x = 400,822,388.93
  5. Step 5: Solve for x
    x = 400,822,388.93/20,718.88
  6. Step 6: Final answer
    x = 19,345.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.