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Finding the Fourth Proportional to 20,859.70, 28,787.12 and 11,428.27

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Solution

The fourth proportional to 20,859.70, 28,787.12 and 11,428.27 is: 15,771.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.70 : 28,787.12 = 11,428.27 : x
  2. Step 2: Convert to fraction form
    20,859.70/28,787.12 = 11,428.27/x
  3. Step 3: Cross multiply
    20,859.70x = 28,787.12 × 11,428.27
  4. Step 4: Simplify right side
    20,859.70x = 328,986,979.88
  5. Step 5: Solve for x
    x = 328,986,979.88/20,859.70
  6. Step 6: Final answer
    x = 15,771.41

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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.