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Finding the Fourth Proportional to 380.20, 524.78 and 247.79

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Solution

The fourth proportional to 380.20, 524.78 and 247.79 is: 342.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.20 : 524.78 = 247.79 : x
  2. Step 2: Convert to fraction form
    380.20/524.78 = 247.79/x
  3. Step 3: Cross multiply
    380.20x = 524.78 × 247.79
  4. Step 4: Simplify right side
    380.20x = 130,033.92
  5. Step 5: Solve for x
    x = 130,033.92/380.20
  6. Step 6: Final answer
    x = 342.01

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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.