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Finding the Fourth Proportional to 252.80, 379.05 and 90.45

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Solution

The fourth proportional to 252.80, 379.05 and 90.45 is: 135.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.80 : 379.05 = 90.45 : x
  2. Step 2: Convert to fraction form
    252.80/379.05 = 90.45/x
  3. Step 3: Cross multiply
    252.80x = 379.05 × 90.45
  4. Step 4: Simplify right side
    252.80x = 34,285.07
  5. Step 5: Solve for x
    x = 34,285.07/252.80
  6. Step 6: Final answer
    x = 135.62

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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.