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Finding the Fourth Proportional to 280.42, 386.97 and 156.08

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Solution

The fourth proportional to 280.42, 386.97 and 156.08 is: 215.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.42 : 386.97 = 156.08 : x
  2. Step 2: Convert to fraction form
    280.42/386.97 = 156.08/x
  3. Step 3: Cross multiply
    280.42x = 386.97 × 156.08
  4. Step 4: Simplify right side
    280.42x = 60,398.28
  5. Step 5: Solve for x
    x = 60,398.28/280.42
  6. Step 6: Final answer
    x = 215.39

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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.