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Finding the Fourth Proportional to 280.48, 421.02 and 199.48

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Solution

The fourth proportional to 280.48, 421.02 and 199.48 is: 299.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.48 : 421.02 = 199.48 : x
  2. Step 2: Convert to fraction form
    280.48/421.02 = 199.48/x
  3. Step 3: Cross multiply
    280.48x = 421.02 × 199.48
  4. Step 4: Simplify right side
    280.48x = 83,985.07
  5. Step 5: Solve for x
    x = 83,985.07/280.48
  6. Step 6: Final answer
    x = 299.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.