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Finding the Fourth Proportional to 116.78, 161.15 and 72.51

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Solution

The fourth proportional to 116.78, 161.15 and 72.51 is: 100.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.78 : 161.15 = 72.51 : x
  2. Step 2: Convert to fraction form
    116.78/161.15 = 72.51/x
  3. Step 3: Cross multiply
    116.78x = 161.15 × 72.51
  4. Step 4: Simplify right side
    116.78x = 11,684.99
  5. Step 5: Solve for x
    x = 11,684.99/116.78
  6. Step 6: Final answer
    x = 100.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.