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Finding the Fourth Proportional to 221,705.60, 332,558.40 and 128,163.20

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Solution

The fourth proportional to 221,705.60, 332,558.40 and 128,163.20 is: 192,244.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,705.60 : 332,558.40 = 128,163.20 : x
  2. Step 2: Convert to fraction form
    221,705.60/332,558.40 = 128,163.20/x
  3. Step 3: Cross multiply
    221,705.60x = 332,558.40 × 128,163.20
  4. Step 4: Simplify right side
    221,705.60x = 42,621,748,730.88
  5. Step 5: Solve for x
    x = 42,621,748,730.88/221,705.60
  6. Step 6: Final answer
    x = 192,244.80

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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.