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Finding the Fourth Proportional to 280.96, 387.80 and 202.23

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Solution

The fourth proportional to 280.96, 387.80 and 202.23 is: 279.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.96 : 387.80 = 202.23 : x
  2. Step 2: Convert to fraction form
    280.96/387.80 = 202.23/x
  3. Step 3: Cross multiply
    280.96x = 387.80 × 202.23
  4. Step 4: Simplify right side
    280.96x = 78,424.79
  5. Step 5: Solve for x
    x = 78,424.79/280.96
  6. Step 6: Final answer
    x = 279.13

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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.