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Finding the Fourth Proportional to 280.67, 387.31 and 156.33

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Solution

The fourth proportional to 280.67, 387.31 and 156.33 is: 215.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.67 : 387.31 = 156.33 : x
  2. Step 2: Convert to fraction form
    280.67/387.31 = 156.33/x
  3. Step 3: Cross multiply
    280.67x = 387.31 × 156.33
  4. Step 4: Simplify right side
    280.67x = 60,548.17
  5. Step 5: Solve for x
    x = 60,548.17/280.67
  6. Step 6: Final answer
    x = 215.73

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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.