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Finding the Fourth Proportional to 20,935.80, 28,893 and 11,986.08

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Solution

The fourth proportional to 20,935.80, 28,893 and 11,986.08 is: 16,541.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,935.80 : 28,893 = 11,986.08 : x
  2. Step 2: Convert to fraction form
    20,935.80/28,893 = 11,986.08/x
  3. Step 3: Cross multiply
    20,935.80x = 28,893 × 11,986.08
  4. Step 4: Simplify right side
    20,935.80x = 346,313,809.44
  5. Step 5: Solve for x
    x = 346,313,809.44/20,935.80
  6. Step 6: Final answer
    x = 16,541.70

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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.