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Finding the Fourth Proportional to 113.82, 171.35 and 103.90

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Solution

The fourth proportional to 113.82, 171.35 and 103.90 is: 156.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.82 : 171.35 = 103.90 : x
  2. Step 2: Convert to fraction form
    113.82/171.35 = 103.90/x
  3. Step 3: Cross multiply
    113.82x = 171.35 × 103.90
  4. Step 4: Simplify right side
    113.82x = 17,802.75
  5. Step 5: Solve for x
    x = 17,802.75/113.82
  6. Step 6: Final answer
    x = 156.41

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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.