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Finding the Fourth Proportional to 280.90, 387.24 and 202.20

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Solution

The fourth proportional to 280.90, 387.24 and 202.20 is: 278.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.90 : 387.24 = 202.20 : x
  2. Step 2: Convert to fraction form
    280.90/387.24 = 202.20/x
  3. Step 3: Cross multiply
    280.90x = 387.24 × 202.20
  4. Step 4: Simplify right side
    280.90x = 78,299.93
  5. Step 5: Solve for x
    x = 78,299.93/280.90
  6. Step 6: Final answer
    x = 278.75

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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.