Home / 20,719.31-31,057.49-11,815.65

Finding the Fourth Proportional to 20,719.31, 31,057.49 and 11,815.65

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Solution

The fourth proportional to 20,719.31, 31,057.49 and 11,815.65 is: 17,711.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,719.31 : 31,057.49 = 11,815.65 : x
  2. Step 2: Convert to fraction form
    20,719.31/31,057.49 = 11,815.65/x
  3. Step 3: Cross multiply
    20,719.31x = 31,057.49 × 11,815.65
  4. Step 4: Simplify right side
    20,719.31x = 366,964,461.26
  5. Step 5: Solve for x
    x = 366,964,461.26/20,719.31
  6. Step 6: Final answer
    x = 17,711.23

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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.