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Finding the Fourth Proportional to 178.48, 268.90 and 136

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Solution

The fourth proportional to 178.48, 268.90 and 136 is: 204.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.48 : 268.90 = 136 : x
  2. Step 2: Convert to fraction form
    178.48/268.90 = 136/x
  3. Step 3: Cross multiply
    178.48x = 268.90 × 136
  4. Step 4: Simplify right side
    178.48x = 36,570.40
  5. Step 5: Solve for x
    x = 36,570.40/178.48
  6. Step 6: Final answer
    x = 204.90

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.