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Finding the Fourth Proportional to 280.28, 386.98 and 180.75

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Solution

The fourth proportional to 280.28, 386.98 and 180.75 is: 249.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.28 : 386.98 = 180.75 : x
  2. Step 2: Convert to fraction form
    280.28/386.98 = 180.75/x
  3. Step 3: Cross multiply
    280.28x = 386.98 × 180.75
  4. Step 4: Simplify right side
    280.28x = 69,946.64
  5. Step 5: Solve for x
    x = 69,946.64/280.28
  6. Step 6: Final answer
    x = 249.56

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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.