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Finding the Fourth Proportional to 107.20, 160.46 and 76.28

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Solution

The fourth proportional to 107.20, 160.46 and 76.28 is: 114.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.20 : 160.46 = 76.28 : x
  2. Step 2: Convert to fraction form
    107.20/160.46 = 76.28/x
  3. Step 3: Cross multiply
    107.20x = 160.46 × 76.28
  4. Step 4: Simplify right side
    107.20x = 12,239.78
  5. Step 5: Solve for x
    x = 12,239.78/107.20
  6. Step 6: Final answer
    x = 114.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.