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Finding the Fourth Proportional to 76.53, 105.73 and 59.12

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Solution

The fourth proportional to 76.53, 105.73 and 59.12 is: 81.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.53 : 105.73 = 59.12 : x
  2. Step 2: Convert to fraction form
    76.53/105.73 = 59.12/x
  3. Step 3: Cross multiply
    76.53x = 105.73 × 59.12
  4. Step 4: Simplify right side
    76.53x = 6,250.76
  5. Step 5: Solve for x
    x = 6,250.76/76.53
  6. Step 6: Final answer
    x = 81.68

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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.