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Finding the Fourth Proportional to 170.80, 235.72 and 105.28

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Solution

The fourth proportional to 170.80, 235.72 and 105.28 is: 145.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.80 : 235.72 = 105.28 : x
  2. Step 2: Convert to fraction form
    170.80/235.72 = 105.28/x
  3. Step 3: Cross multiply
    170.80x = 235.72 × 105.28
  4. Step 4: Simplify right side
    170.80x = 24,816.60
  5. Step 5: Solve for x
    x = 24,816.60/170.80
  6. Step 6: Final answer
    x = 145.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.