Home / 28,432.72-39,216-20,876.68

Finding the Fourth Proportional to 28,432.72, 39,216 and 20,876.68

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Solution

The fourth proportional to 28,432.72, 39,216 and 20,876.68 is: 28,794.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,432.72 : 39,216 = 20,876.68 : x
  2. Step 2: Convert to fraction form
    28,432.72/39,216 = 20,876.68/x
  3. Step 3: Cross multiply
    28,432.72x = 39,216 × 20,876.68
  4. Step 4: Simplify right side
    28,432.72x = 818,699,882.88
  5. Step 5: Solve for x
    x = 818,699,882.88/28,432.72
  6. Step 6: Final answer
    x = 28,794.29

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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.