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Finding the Fourth Proportional to 97.45, 134.55 and 76.72

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Solution

The fourth proportional to 97.45, 134.55 and 76.72 is: 105.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.45 : 134.55 = 76.72 : x
  2. Step 2: Convert to fraction form
    97.45/134.55 = 76.72/x
  3. Step 3: Cross multiply
    97.45x = 134.55 × 76.72
  4. Step 4: Simplify right side
    97.45x = 10,322.68
  5. Step 5: Solve for x
    x = 10,322.68/97.45
  6. Step 6: Final answer
    x = 105.93

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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.