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Finding the Fourth Proportional to 20,891.70, 28,833.10 and 11,937.15

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Solution

The fourth proportional to 20,891.70, 28,833.10 and 11,937.15 is: 16,474.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.70 : 28,833.10 = 11,937.15 : x
  2. Step 2: Convert to fraction form
    20,891.70/28,833.10 = 11,937.15/x
  3. Step 3: Cross multiply
    20,891.70x = 28,833.10 × 11,937.15
  4. Step 4: Simplify right side
    20,891.70x = 344,185,009.82
  5. Step 5: Solve for x
    x = 344,185,009.82/20,891.70
  6. Step 6: Final answer
    x = 16,474.72

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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.