Home / 20,857.29-28,782.91-11,425.65

Finding the Fourth Proportional to 20,857.29, 28,782.91 and 11,425.65

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Solution

The fourth proportional to 20,857.29, 28,782.91 and 11,425.65 is: 15,767.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.29 : 28,782.91 = 11,425.65 : x
  2. Step 2: Convert to fraction form
    20,857.29/28,782.91 = 11,425.65/x
  3. Step 3: Cross multiply
    20,857.29x = 28,782.91 × 11,425.65
  4. Step 4: Simplify right side
    20,857.29x = 328,863,455.64
  5. Step 5: Solve for x
    x = 328,863,455.64/20,857.29
  6. Step 6: Final answer
    x = 15,767.31

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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.