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Finding the Fourth Proportional to 107.15, 147.91 and 82.67

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Solution

The fourth proportional to 107.15, 147.91 and 82.67 is: 114.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.15 : 147.91 = 82.67 : x
  2. Step 2: Convert to fraction form
    107.15/147.91 = 82.67/x
  3. Step 3: Cross multiply
    107.15x = 147.91 × 82.67
  4. Step 4: Simplify right side
    107.15x = 12,226.77
  5. Step 5: Solve for x
    x = 12,226.77/107.15
  6. Step 6: Final answer
    x = 114.11

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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.