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Finding the Fourth Proportional to 280.08, 386.19 and 238.56

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Solution

The fourth proportional to 280.08, 386.19 and 238.56 is: 328.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.08 : 386.19 = 238.56 : x
  2. Step 2: Convert to fraction form
    280.08/386.19 = 238.56/x
  3. Step 3: Cross multiply
    280.08x = 386.19 × 238.56
  4. Step 4: Simplify right side
    280.08x = 92,129.49
  5. Step 5: Solve for x
    x = 92,129.49/280.08
  6. Step 6: Final answer
    x = 328.94

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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.