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Finding the Fourth Proportional to 280.80, 387.55 and 181.23

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Solution

The fourth proportional to 280.80, 387.55 and 181.23 is: 250.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.80 : 387.55 = 181.23 : x
  2. Step 2: Convert to fraction form
    280.80/387.55 = 181.23/x
  3. Step 3: Cross multiply
    280.80x = 387.55 × 181.23
  4. Step 4: Simplify right side
    280.80x = 70,235.69
  5. Step 5: Solve for x
    x = 70,235.69/280.80
  6. Step 6: Final answer
    x = 250.13

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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.