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Finding the Fourth Proportional to 115.73, 159.70 and 66.60

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Solution

The fourth proportional to 115.73, 159.70 and 66.60 is: 91.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.73 : 159.70 = 66.60 : x
  2. Step 2: Convert to fraction form
    115.73/159.70 = 66.60/x
  3. Step 3: Cross multiply
    115.73x = 159.70 × 66.60
  4. Step 4: Simplify right side
    115.73x = 10,636.02
  5. Step 5: Solve for x
    x = 10,636.02/115.73
  6. Step 6: Final answer
    x = 91.90

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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.