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Finding the Fourth Proportional to 275.61, 380.40 and 170.85

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Solution

The fourth proportional to 275.61, 380.40 and 170.85 is: 235.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.61 : 380.40 = 170.85 : x
  2. Step 2: Convert to fraction form
    275.61/380.40 = 170.85/x
  3. Step 3: Cross multiply
    275.61x = 380.40 × 170.85
  4. Step 4: Simplify right side
    275.61x = 64,991.34
  5. Step 5: Solve for x
    x = 64,991.34/275.61
  6. Step 6: Final answer
    x = 235.81

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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.