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Finding the Fourth Proportional to 116.90, 161.30 and 65.14

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Solution

The fourth proportional to 116.90, 161.30 and 65.14 is: 89.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.90 : 161.30 = 65.14 : x
  2. Step 2: Convert to fraction form
    116.90/161.30 = 65.14/x
  3. Step 3: Cross multiply
    116.90x = 161.30 × 65.14
  4. Step 4: Simplify right side
    116.90x = 10,507.08
  5. Step 5: Solve for x
    x = 10,507.08/116.90
  6. Step 6: Final answer
    x = 89.88

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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.