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Finding the Fourth Proportional to 221,458.60, 332,187.90 and 81,271.90

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Solution

The fourth proportional to 221,458.60, 332,187.90 and 81,271.90 is: 121,907.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,458.60 : 332,187.90 = 81,271.90 : x
  2. Step 2: Convert to fraction form
    221,458.60/332,187.90 = 81,271.90/x
  3. Step 3: Cross multiply
    221,458.60x = 332,187.90 × 81,271.90
  4. Step 4: Simplify right side
    221,458.60x = 26,997,541,790.01
  5. Step 5: Solve for x
    x = 26,997,541,790.01/221,458.60
  6. Step 6: Final answer
    x = 121,907.85

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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.