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Finding the Fourth Proportional to 238.56, 357.66 and 147.21

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Solution

The fourth proportional to 238.56, 357.66 and 147.21 is: 220.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.56 : 357.66 = 147.21 : x
  2. Step 2: Convert to fraction form
    238.56/357.66 = 147.21/x
  3. Step 3: Cross multiply
    238.56x = 357.66 × 147.21
  4. Step 4: Simplify right side
    238.56x = 52,651.13
  5. Step 5: Solve for x
    x = 52,651.13/238.56
  6. Step 6: Final answer
    x = 220.70

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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.