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Finding the Fourth Proportional to 221.68, 305.70 and 147.92

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Solution

The fourth proportional to 221.68, 305.70 and 147.92 is: 203.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.68 : 305.70 = 147.92 : x
  2. Step 2: Convert to fraction form
    221.68/305.70 = 147.92/x
  3. Step 3: Cross multiply
    221.68x = 305.70 × 147.92
  4. Step 4: Simplify right side
    221.68x = 45,219.14
  5. Step 5: Solve for x
    x = 45,219.14/221.68
  6. Step 6: Final answer
    x = 203.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.