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Finding the Fourth Proportional to 221,311.70, 331,530.15 and 121,292.90

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Solution

The fourth proportional to 221,311.70, 331,530.15 and 121,292.90 is: 181,699.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,311.70 : 331,530.15 = 121,292.90 : x
  2. Step 2: Convert to fraction form
    221,311.70/331,530.15 = 121,292.90/x
  3. Step 3: Cross multiply
    221,311.70x = 331,530.15 × 121,292.90
  4. Step 4: Simplify right side
    221,311.70x = 40,212,253,330.94
  5. Step 5: Solve for x
    x = 40,212,253,330.94/221,311.70
  6. Step 6: Final answer
    x = 181,699.63

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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.