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Finding the Fourth Proportional to 116.86, 161.28 and 67.72

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Solution

The fourth proportional to 116.86, 161.28 and 67.72 is: 93.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.86 : 161.28 = 67.72 : x
  2. Step 2: Convert to fraction form
    116.86/161.28 = 67.72/x
  3. Step 3: Cross multiply
    116.86x = 161.28 × 67.72
  4. Step 4: Simplify right side
    116.86x = 10,921.88
  5. Step 5: Solve for x
    x = 10,921.88/116.86
  6. Step 6: Final answer
    x = 93.46

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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.