Home / 20,389.80-28,136.47-11,315.65

Finding the Fourth Proportional to 20,389.80, 28,136.47 and 11,315.65

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Solution

The fourth proportional to 20,389.80, 28,136.47 and 11,315.65 is: 15,614.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.80 : 28,136.47 = 11,315.65 : x
  2. Step 2: Convert to fraction form
    20,389.80/28,136.47 = 11,315.65/x
  3. Step 3: Cross multiply
    20,389.80x = 28,136.47 × 11,315.65
  4. Step 4: Simplify right side
    20,389.80x = 318,382,306.07
  5. Step 5: Solve for x
    x = 318,382,306.07/20,389.80
  6. Step 6: Final answer
    x = 15,614.79

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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.