Home / 21,169.08-31,752.72-7,128.18

Finding the Fourth Proportional to 21,169.08, 31,752.72 and 7,128.18

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Solution

The fourth proportional to 21,169.08, 31,752.72 and 7,128.18 is: 10,691.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,169.08 : 31,752.72 = 7,128.18 : x
  2. Step 2: Convert to fraction form
    21,169.08/31,752.72 = 7,128.18/x
  3. Step 3: Cross multiply
    21,169.08x = 31,752.72 × 7,128.18
  4. Step 4: Simplify right side
    21,169.08x = 226,339,103.65
  5. Step 5: Solve for x
    x = 226,339,103.65/21,169.08
  6. Step 6: Final answer
    x = 10,691.97

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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.