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Finding the Fourth Proportional to 106.33, 159.40 and 52.20

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Solution

The fourth proportional to 106.33, 159.40 and 52.20 is: 78.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.33 : 159.40 = 52.20 : x
  2. Step 2: Convert to fraction form
    106.33/159.40 = 52.20/x
  3. Step 3: Cross multiply
    106.33x = 159.40 × 52.20
  4. Step 4: Simplify right side
    106.33x = 8,320.68
  5. Step 5: Solve for x
    x = 8,320.68/106.33
  6. Step 6: Final answer
    x = 78.25

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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.