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Finding the Fourth Proportional to 107.21, 160.64 and 55.78

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Solution

The fourth proportional to 107.21, 160.64 and 55.78 is: 83.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.21 : 160.64 = 55.78 : x
  2. Step 2: Convert to fraction form
    107.21/160.64 = 55.78/x
  3. Step 3: Cross multiply
    107.21x = 160.64 × 55.78
  4. Step 4: Simplify right side
    107.21x = 8,960.22
  5. Step 5: Solve for x
    x = 8,960.22/107.21
  6. Step 6: Final answer
    x = 83.58

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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.