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Finding the Fourth Proportional to 20,392.80, 28,145.20 and 11,443.92

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Solution

The fourth proportional to 20,392.80, 28,145.20 and 11,443.92 is: 15,794.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,392.80 : 28,145.20 = 11,443.92 : x
  2. Step 2: Convert to fraction form
    20,392.80/28,145.20 = 11,443.92/x
  3. Step 3: Cross multiply
    20,392.80x = 28,145.20 × 11,443.92
  4. Step 4: Simplify right side
    20,392.80x = 322,091,417.18
  5. Step 5: Solve for x
    x = 322,091,417.18/20,392.80
  6. Step 6: Final answer
    x = 15,794.37

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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.