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Finding the Fourth Proportional to 307.98, 424.89 and 203.12

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Solution

The fourth proportional to 307.98, 424.89 and 203.12 is: 280.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.98 : 424.89 = 203.12 : x
  2. Step 2: Convert to fraction form
    307.98/424.89 = 203.12/x
  3. Step 3: Cross multiply
    307.98x = 424.89 × 203.12
  4. Step 4: Simplify right side
    307.98x = 86,304.72
  5. Step 5: Solve for x
    x = 86,304.72/307.98
  6. Step 6: Final answer
    x = 280.23

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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.