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Finding the Fourth Proportional to 76.15, 113.67 and 70.69

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Solution

The fourth proportional to 76.15, 113.67 and 70.69 is: 105.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.15 : 113.67 = 70.69 : x
  2. Step 2: Convert to fraction form
    76.15/113.67 = 70.69/x
  3. Step 3: Cross multiply
    76.15x = 113.67 × 70.69
  4. Step 4: Simplify right side
    76.15x = 8,035.33
  5. Step 5: Solve for x
    x = 8,035.33/76.15
  6. Step 6: Final answer
    x = 105.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.