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Finding the Fourth Proportional to 116.71, 161.20 and 85.58

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Solution

The fourth proportional to 116.71, 161.20 and 85.58 is: 118.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.71 : 161.20 = 85.58 : x
  2. Step 2: Convert to fraction form
    116.71/161.20 = 85.58/x
  3. Step 3: Cross multiply
    116.71x = 161.20 × 85.58
  4. Step 4: Simplify right side
    116.71x = 13,795.50
  5. Step 5: Solve for x
    x = 13,795.50/116.71
  6. Step 6: Final answer
    x = 118.20

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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.