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Finding the Fourth Proportional to 252.65, 378.98 and 70.05

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Solution

The fourth proportional to 252.65, 378.98 and 70.05 is: 105.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.65 : 378.98 = 70.05 : x
  2. Step 2: Convert to fraction form
    252.65/378.98 = 70.05/x
  3. Step 3: Cross multiply
    252.65x = 378.98 × 70.05
  4. Step 4: Simplify right side
    252.65x = 26,546.75
  5. Step 5: Solve for x
    x = 26,546.75/252.65
  6. Step 6: Final answer
    x = 105.07

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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.