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Finding the Fourth Proportional to 280.33, 386.86 and 156

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Solution

The fourth proportional to 280.33, 386.86 and 156 is: 215.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.33 : 386.86 = 156 : x
  2. Step 2: Convert to fraction form
    280.33/386.86 = 156/x
  3. Step 3: Cross multiply
    280.33x = 386.86 × 156
  4. Step 4: Simplify right side
    280.33x = 60,350.16
  5. Step 5: Solve for x
    x = 60,350.16/280.33
  6. Step 6: Final answer
    x = 215.28

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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.