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Finding the Fourth Proportional to 238.40, 357.43 and 135.53

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Solution

The fourth proportional to 238.40, 357.43 and 135.53 is: 203.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.40 : 357.43 = 135.53 : x
  2. Step 2: Convert to fraction form
    238.40/357.43 = 135.53/x
  3. Step 3: Cross multiply
    238.40x = 357.43 × 135.53
  4. Step 4: Simplify right side
    238.40x = 48,442.49
  5. Step 5: Solve for x
    x = 48,442.49/238.40
  6. Step 6: Final answer
    x = 203.20

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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.