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Finding the Fourth Proportional to 238.90, 330.06 and 202.45

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Solution

The fourth proportional to 238.90, 330.06 and 202.45 is: 279.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.90 : 330.06 = 202.45 : x
  2. Step 2: Convert to fraction form
    238.90/330.06 = 202.45/x
  3. Step 3: Cross multiply
    238.90x = 330.06 × 202.45
  4. Step 4: Simplify right side
    238.90x = 66,820.65
  5. Step 5: Solve for x
    x = 66,820.65/238.90
  6. Step 6: Final answer
    x = 279.70

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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.