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Finding the Fourth Proportional to 116.91, 161.21 and 99.49

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Solution

The fourth proportional to 116.91, 161.21 and 99.49 is: 137.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.91 : 161.21 = 99.49 : x
  2. Step 2: Convert to fraction form
    116.91/161.21 = 99.49/x
  3. Step 3: Cross multiply
    116.91x = 161.21 × 99.49
  4. Step 4: Simplify right side
    116.91x = 16,038.63
  5. Step 5: Solve for x
    x = 16,038.63/116.91
  6. Step 6: Final answer
    x = 137.19

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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.