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Finding the Fourth Proportional to 280.80, 387.48 and 154.74

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Solution

The fourth proportional to 280.80, 387.48 and 154.74 is: 213.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.80 : 387.48 = 154.74 : x
  2. Step 2: Convert to fraction form
    280.80/387.48 = 154.74/x
  3. Step 3: Cross multiply
    280.80x = 387.48 × 154.74
  4. Step 4: Simplify right side
    280.80x = 59,958.66
  5. Step 5: Solve for x
    x = 59,958.66/280.80
  6. Step 6: Final answer
    x = 213.53

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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.