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Finding the Fourth Proportional to 106.87, 160.40 and 55.54

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Solution

The fourth proportional to 106.87, 160.40 and 55.54 is: 83.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.87 : 160.40 = 55.54 : x
  2. Step 2: Convert to fraction form
    106.87/160.40 = 55.54/x
  3. Step 3: Cross multiply
    106.87x = 160.40 × 55.54
  4. Step 4: Simplify right side
    106.87x = 8,908.62
  5. Step 5: Solve for x
    x = 8,908.62/106.87
  6. Step 6: Final answer
    x = 83.36

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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.