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Finding the Fourth Proportional to 80,121.99, 120,210.71 and 30,216.40

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Solution

The fourth proportional to 80,121.99, 120,210.71 and 30,216.40 is: 45,335.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,121.99 : 120,210.71 = 30,216.40 : x
  2. Step 2: Convert to fraction form
    80,121.99/120,210.71 = 30,216.40/x
  3. Step 3: Cross multiply
    80,121.99x = 120,210.71 × 30,216.40
  4. Step 4: Simplify right side
    80,121.99x = 3,632,334,897.64
  5. Step 5: Solve for x
    x = 3,632,334,897.64/80,121.99
  6. Step 6: Final answer
    x = 45,335.06

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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.