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Finding the Fourth Proportional to 20,479.77, 30,695.68 and 7,821.23

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Solution

The fourth proportional to 20,479.77, 30,695.68 and 7,821.23 is: 11,722.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.77 : 30,695.68 = 7,821.23 : x
  2. Step 2: Convert to fraction form
    20,479.77/30,695.68 = 7,821.23/x
  3. Step 3: Cross multiply
    20,479.77x = 30,695.68 × 7,821.23
  4. Step 4: Simplify right side
    20,479.77x = 240,078,110.58
  5. Step 5: Solve for x
    x = 240,078,110.58/20,479.77
  6. Step 6: Final answer
    x = 11,722.69

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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.