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Finding the Fourth Proportional to 238.75, 358.15 and 76.40

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Solution

The fourth proportional to 238.75, 358.15 and 76.40 is: 114.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.75 : 358.15 = 76.40 : x
  2. Step 2: Convert to fraction form
    238.75/358.15 = 76.40/x
  3. Step 3: Cross multiply
    238.75x = 358.15 × 76.40
  4. Step 4: Simplify right side
    238.75x = 27,360.49
  5. Step 5: Solve for x
    x = 27,360.49/238.75
  6. Step 6: Final answer
    x = 114.60

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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.