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Finding the Fourth Proportional to 116.50, 160.78 and 86.62

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Solution

The fourth proportional to 116.50, 160.78 and 86.62 is: 119.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.50 : 160.78 = 86.62 : x
  2. Step 2: Convert to fraction form
    116.50/160.78 = 86.62/x
  3. Step 3: Cross multiply
    116.50x = 160.78 × 86.62
  4. Step 4: Simplify right side
    116.50x = 13,926.76
  5. Step 5: Solve for x
    x = 13,926.76/116.50
  6. Step 6: Final answer
    x = 119.54

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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.