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Finding the Fourth Proportional to 165.05, 247.32 and 87.98

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Solution

The fourth proportional to 165.05, 247.32 and 87.98 is: 131.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.05 : 247.32 = 87.98 : x
  2. Step 2: Convert to fraction form
    165.05/247.32 = 87.98/x
  3. Step 3: Cross multiply
    165.05x = 247.32 × 87.98
  4. Step 4: Simplify right side
    165.05x = 21,759.83
  5. Step 5: Solve for x
    x = 21,759.83/165.05
  6. Step 6: Final answer
    x = 131.84

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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.