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Finding the Fourth Proportional to 310.66, 428.71 and 170.77

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Solution

The fourth proportional to 310.66, 428.71 and 170.77 is: 235.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.66 : 428.71 = 170.77 : x
  2. Step 2: Convert to fraction form
    310.66/428.71 = 170.77/x
  3. Step 3: Cross multiply
    310.66x = 428.71 × 170.77
  4. Step 4: Simplify right side
    310.66x = 73,211.03
  5. Step 5: Solve for x
    x = 73,211.03/310.66
  6. Step 6: Final answer
    x = 235.66

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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.