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Finding the Fourth Proportional to 20,891.52, 28,828.80 and 11,939.40

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Solution

The fourth proportional to 20,891.52, 28,828.80 and 11,939.40 is: 16,475.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.52 : 28,828.80 = 11,939.40 : x
  2. Step 2: Convert to fraction form
    20,891.52/28,828.80 = 11,939.40/x
  3. Step 3: Cross multiply
    20,891.52x = 28,828.80 × 11,939.40
  4. Step 4: Simplify right side
    20,891.52x = 344,198,574.72
  5. Step 5: Solve for x
    x = 344,198,574.72/20,891.52
  6. Step 6: Final answer
    x = 16,475.52

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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.