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Finding the Fourth Proportional to 280.05, 386.13 and 231.04

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Solution

The fourth proportional to 280.05, 386.13 and 231.04 is: 318.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.05 : 386.13 = 231.04 : x
  2. Step 2: Convert to fraction form
    280.05/386.13 = 231.04/x
  3. Step 3: Cross multiply
    280.05x = 386.13 × 231.04
  4. Step 4: Simplify right side
    280.05x = 89,211.48
  5. Step 5: Solve for x
    x = 89,211.48/280.05
  6. Step 6: Final answer
    x = 318.56

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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.