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Finding the Fourth Proportional to 215,811.20, 323,716.80 and 122,499.20

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Solution

The fourth proportional to 215,811.20, 323,716.80 and 122,499.20 is: 183,748.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,811.20 : 323,716.80 = 122,499.20 : x
  2. Step 2: Convert to fraction form
    215,811.20/323,716.80 = 122,499.20/x
  3. Step 3: Cross multiply
    215,811.20x = 323,716.80 × 122,499.20
  4. Step 4: Simplify right side
    215,811.20x = 39,655,049,026.56
  5. Step 5: Solve for x
    x = 39,655,049,026.56/215,811.20
  6. Step 6: Final answer
    x = 183,748.80

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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.