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Finding the Fourth Proportional to 107.87, 148.90 and 76.81

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Solution

The fourth proportional to 107.87, 148.90 and 76.81 is: 106.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.87 : 148.90 = 76.81 : x
  2. Step 2: Convert to fraction form
    107.87/148.90 = 76.81/x
  3. Step 3: Cross multiply
    107.87x = 148.90 × 76.81
  4. Step 4: Simplify right side
    107.87x = 11,437.01
  5. Step 5: Solve for x
    x = 11,437.01/107.87
  6. Step 6: Final answer
    x = 106.03

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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.