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Finding the Fourth Proportional to 20,378.91, 30,572.97 and 7,231.28

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Solution

The fourth proportional to 20,378.91, 30,572.97 and 7,231.28 is: 10,848.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.91 : 30,572.97 = 7,231.28 : x
  2. Step 2: Convert to fraction form
    20,378.91/30,572.97 = 7,231.28/x
  3. Step 3: Cross multiply
    20,378.91x = 30,572.97 × 7,231.28
  4. Step 4: Simplify right side
    20,378.91x = 221,081,755.82
  5. Step 5: Solve for x
    x = 221,081,755.82/20,378.91
  6. Step 6: Final answer
    x = 10,848.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.