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Finding the Fourth Proportional to 28,414.32, 39,212.88 and 15,839.88

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Solution

The fourth proportional to 28,414.32, 39,212.88 and 15,839.88 is: 21,859.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,414.32 : 39,212.88 = 15,839.88 : x
  2. Step 2: Convert to fraction form
    28,414.32/39,212.88 = 15,839.88/x
  3. Step 3: Cross multiply
    28,414.32x = 39,212.88 × 15,839.88
  4. Step 4: Simplify right side
    28,414.32x = 621,127,313.65
  5. Step 5: Solve for x
    x = 621,127,313.65/28,414.32
  6. Step 6: Final answer
    x = 21,859.66

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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.