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Finding the Fourth Proportional to 310.40, 428.35 and 170.53

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Solution

The fourth proportional to 310.40, 428.35 and 170.53 is: 235.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.40 : 428.35 = 170.53 : x
  2. Step 2: Convert to fraction form
    310.40/428.35 = 170.53/x
  3. Step 3: Cross multiply
    310.40x = 428.35 × 170.53
  4. Step 4: Simplify right side
    310.40x = 73,044.54
  5. Step 5: Solve for x
    x = 73,044.54/310.40
  6. Step 6: Final answer
    x = 235.33

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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.