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Finding the Fourth Proportional to 97.76, 146.70 and 77.60

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Solution

The fourth proportional to 97.76, 146.70 and 77.60 is: 116.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.76 : 146.70 = 77.60 : x
  2. Step 2: Convert to fraction form
    97.76/146.70 = 77.60/x
  3. Step 3: Cross multiply
    97.76x = 146.70 × 77.60
  4. Step 4: Simplify right side
    97.76x = 11,383.19
  5. Step 5: Solve for x
    x = 11,383.19/97.76
  6. Step 6: Final answer
    x = 116.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.