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Finding the Fourth Proportional to 252.90, 379.28 and 70.31

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Solution

The fourth proportional to 252.90, 379.28 and 70.31 is: 105.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.90 : 379.28 = 70.31 : x
  2. Step 2: Convert to fraction form
    252.90/379.28 = 70.31/x
  3. Step 3: Cross multiply
    252.90x = 379.28 × 70.31
  4. Step 4: Simplify right side
    252.90x = 26,664.93
  5. Step 5: Solve for x
    x = 26,664.93/252.90
  6. Step 6: Final answer
    x = 105.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.