Home / 28,778.89-39,715.95-15,858.71

Finding the Fourth Proportional to 28,778.89, 39,715.95 and 15,858.71

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Solution

The fourth proportional to 28,778.89, 39,715.95 and 15,858.71 is: 21,885.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,778.89 : 39,715.95 = 15,858.71 : x
  2. Step 2: Convert to fraction form
    28,778.89/39,715.95 = 15,858.71/x
  3. Step 3: Cross multiply
    28,778.89x = 39,715.95 × 15,858.71
  4. Step 4: Simplify right side
    28,778.89x = 629,843,733.42
  5. Step 5: Solve for x
    x = 629,843,733.42/28,778.89
  6. Step 6: Final answer
    x = 21,885.62

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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.