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Finding the Fourth Proportional to 221,339.20, 331,571.40 and 121,320.40

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Solution

The fourth proportional to 221,339.20, 331,571.40 and 121,320.40 is: 181,740.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,339.20 : 331,571.40 = 121,320.40 : x
  2. Step 2: Convert to fraction form
    221,339.20/331,571.40 = 121,320.40/x
  3. Step 3: Cross multiply
    221,339.20x = 331,571.40 × 121,320.40
  4. Step 4: Simplify right side
    221,339.20x = 40,226,374,876.56
  5. Step 5: Solve for x
    x = 40,226,374,876.56/221,339.20
  6. Step 6: Final answer
    x = 181,740.85

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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.