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Finding the Fourth Proportional to 178.92, 268.50 and 87.72

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Solution

The fourth proportional to 178.92, 268.50 and 87.72 is: 131.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.92 : 268.50 = 87.72 : x
  2. Step 2: Convert to fraction form
    178.92/268.50 = 87.72/x
  3. Step 3: Cross multiply
    178.92x = 268.50 × 87.72
  4. Step 4: Simplify right side
    178.92x = 23,552.82
  5. Step 5: Solve for x
    x = 23,552.82/178.92
  6. Step 6: Final answer
    x = 131.64

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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.