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Finding the Fourth Proportional to 20,479.35, 30,695.05 and 7,820.81

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Solution

The fourth proportional to 20,479.35, 30,695.05 and 7,820.81 is: 11,722.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.35 : 30,695.05 = 7,820.81 : x
  2. Step 2: Convert to fraction form
    20,479.35/30,695.05 = 7,820.81/x
  3. Step 3: Cross multiply
    20,479.35x = 30,695.05 × 7,820.81
  4. Step 4: Simplify right side
    20,479.35x = 240,060,211.18
  5. Step 5: Solve for x
    x = 240,060,211.18/20,479.35
  6. Step 6: Final answer
    x = 11,722.06

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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.