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Finding the Fourth Proportional to 116.96, 161.30 and 90.74

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Solution

The fourth proportional to 116.96, 161.30 and 90.74 is: 125.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.96 : 161.30 = 90.74 : x
  2. Step 2: Convert to fraction form
    116.96/161.30 = 90.74/x
  3. Step 3: Cross multiply
    116.96x = 161.30 × 90.74
  4. Step 4: Simplify right side
    116.96x = 14,636.36
  5. Step 5: Solve for x
    x = 14,636.36/116.96
  6. Step 6: Final answer
    x = 125.14

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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.