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Finding the Fourth Proportional to 223.12, 307.84 and 157.68

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Solution

The fourth proportional to 223.12, 307.84 and 157.68 is: 217.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.12 : 307.84 = 157.68 : x
  2. Step 2: Convert to fraction form
    223.12/307.84 = 157.68/x
  3. Step 3: Cross multiply
    223.12x = 307.84 × 157.68
  4. Step 4: Simplify right side
    223.12x = 48,540.21
  5. Step 5: Solve for x
    x = 48,540.21/223.12
  6. Step 6: Final answer
    x = 217.55

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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.