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Finding the Fourth Proportional to 20,935.79, 28,891.51 and 11,375.76

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Solution

The fourth proportional to 20,935.79, 28,891.51 and 11,375.76 is: 15,698.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,935.79 : 28,891.51 = 11,375.76 : x
  2. Step 2: Convert to fraction form
    20,935.79/28,891.51 = 11,375.76/x
  3. Step 3: Cross multiply
    20,935.79x = 28,891.51 × 11,375.76
  4. Step 4: Simplify right side
    20,935.79x = 328,662,833.18
  5. Step 5: Solve for x
    x = 328,662,833.18/20,935.79
  6. Step 6: Final answer
    x = 15,698.61

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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.