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Finding the Fourth Proportional to 161.25, 241.53 and 78.86

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Solution

The fourth proportional to 161.25, 241.53 and 78.86 is: 118.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.25 : 241.53 = 78.86 : x
  2. Step 2: Convert to fraction form
    161.25/241.53 = 78.86/x
  3. Step 3: Cross multiply
    161.25x = 241.53 × 78.86
  4. Step 4: Simplify right side
    161.25x = 19,047.66
  5. Step 5: Solve for x
    x = 19,047.66/161.25
  6. Step 6: Final answer
    x = 118.13

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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.