Home / 28,381.78-39,167.58-15,806.80

Finding the Fourth Proportional to 28,381.78, 39,167.58 and 15,806.80

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Solution

The fourth proportional to 28,381.78, 39,167.58 and 15,806.80 is: 21,813.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,381.78 : 39,167.58 = 15,806.80 : x
  2. Step 2: Convert to fraction form
    28,381.78/39,167.58 = 15,806.80/x
  3. Step 3: Cross multiply
    28,381.78x = 39,167.58 × 15,806.80
  4. Step 4: Simplify right side
    28,381.78x = 619,114,103.54
  5. Step 5: Solve for x
    x = 619,114,103.54/28,381.78
  6. Step 6: Final answer
    x = 21,813.79

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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.