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Finding the Fourth Proportional to 238.68, 357.90 and 84.56

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Solution

The fourth proportional to 238.68, 357.90 and 84.56 is: 126.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.68 : 357.90 = 84.56 : x
  2. Step 2: Convert to fraction form
    238.68/357.90 = 84.56/x
  3. Step 3: Cross multiply
    238.68x = 357.90 × 84.56
  4. Step 4: Simplify right side
    238.68x = 30,264.02
  5. Step 5: Solve for x
    x = 30,264.02/238.68
  6. Step 6: Final answer
    x = 126.80

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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.