Home / 20,515.89-28,284.50-15,389.61

Finding the Fourth Proportional to 20,515.89, 28,284.50 and 15,389.61

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Solution

The fourth proportional to 20,515.89, 28,284.50 and 15,389.61 is: 21,217.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.89 : 28,284.50 = 15,389.61 : x
  2. Step 2: Convert to fraction form
    20,515.89/28,284.50 = 15,389.61/x
  3. Step 3: Cross multiply
    20,515.89x = 28,284.50 × 15,389.61
  4. Step 4: Simplify right side
    20,515.89x = 435,287,462.52
  5. Step 5: Solve for x
    x = 435,287,462.52/20,515.89
  6. Step 6: Final answer
    x = 21,217.09

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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.