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Finding the Fourth Proportional to 165.78, 247.59 and 131.58

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Solution

The fourth proportional to 165.78, 247.59 and 131.58 is: 196.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.78 : 247.59 = 131.58 : x
  2. Step 2: Convert to fraction form
    165.78/247.59 = 131.58/x
  3. Step 3: Cross multiply
    165.78x = 247.59 × 131.58
  4. Step 4: Simplify right side
    165.78x = 32,577.89
  5. Step 5: Solve for x
    x = 32,577.89/165.78
  6. Step 6: Final answer
    x = 196.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.