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Finding the Fourth Proportional to 107.83, 161.80 and 85.20

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Solution

The fourth proportional to 107.83, 161.80 and 85.20 is: 127.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.83 : 161.80 = 85.20 : x
  2. Step 2: Convert to fraction form
    107.83/161.80 = 85.20/x
  3. Step 3: Cross multiply
    107.83x = 161.80 × 85.20
  4. Step 4: Simplify right side
    107.83x = 13,785.45
  5. Step 5: Solve for x
    x = 13,785.45/107.83
  6. Step 6: Final answer
    x = 127.84

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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.