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Finding the Fourth Proportional to 238.39, 328.90 and 145.11

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Solution

The fourth proportional to 238.39, 328.90 and 145.11 is: 200.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.39 : 328.90 = 145.11 : x
  2. Step 2: Convert to fraction form
    238.39/328.90 = 145.11/x
  3. Step 3: Cross multiply
    238.39x = 328.90 × 145.11
  4. Step 4: Simplify right side
    238.39x = 47,724.31
  5. Step 5: Solve for x
    x = 47,724.31/238.39
  6. Step 6: Final answer
    x = 200.19

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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.