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Finding the Fourth Proportional to 170.76, 235.56 and 100.80

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Solution

The fourth proportional to 170.76, 235.56 and 100.80 is: 139.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.76 : 235.56 = 100.80 : x
  2. Step 2: Convert to fraction form
    170.76/235.56 = 100.80/x
  3. Step 3: Cross multiply
    170.76x = 235.56 × 100.80
  4. Step 4: Simplify right side
    170.76x = 23,744.45
  5. Step 5: Solve for x
    x = 23,744.45/170.76
  6. Step 6: Final answer
    x = 139.05

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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.