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Finding the Fourth Proportional to 221,340.20, 331,572.90 and 121,321.40

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Solution

The fourth proportional to 221,340.20, 331,572.90 and 121,321.40 is: 181,742.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,340.20 : 331,572.90 = 121,321.40 : x
  2. Step 2: Convert to fraction form
    221,340.20/331,572.90 = 121,321.40/x
  3. Step 3: Cross multiply
    221,340.20x = 331,572.90 × 121,321.40
  4. Step 4: Simplify right side
    221,340.20x = 40,226,888,430.06
  5. Step 5: Solve for x
    x = 40,226,888,430.06/221,340.20
  6. Step 6: Final answer
    x = 181,742.35

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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.