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Finding the Fourth Proportional to 107.40, 160.88 and 76.84

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Solution

The fourth proportional to 107.40, 160.88 and 76.84 is: 115.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.40 : 160.88 = 76.84 : x
  2. Step 2: Convert to fraction form
    107.40/160.88 = 76.84/x
  3. Step 3: Cross multiply
    107.40x = 160.88 × 76.84
  4. Step 4: Simplify right side
    107.40x = 12,362.02
  5. Step 5: Solve for x
    x = 12,362.02/107.40
  6. Step 6: Final answer
    x = 115.10

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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.