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Finding the Fourth Proportional to 116.78, 174.20 and 109.02

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Solution

The fourth proportional to 116.78, 174.20 and 109.02 is: 162.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.78 : 174.20 = 109.02 : x
  2. Step 2: Convert to fraction form
    116.78/174.20 = 109.02/x
  3. Step 3: Cross multiply
    116.78x = 174.20 × 109.02
  4. Step 4: Simplify right side
    116.78x = 18,991.28
  5. Step 5: Solve for x
    x = 18,991.28/116.78
  6. Step 6: Final answer
    x = 162.62

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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.