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Finding the Fourth Proportional to 307.80, 462.31 and 279.25

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Solution

The fourth proportional to 307.80, 462.31 and 279.25 is: 419.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.80 : 462.31 = 279.25 : x
  2. Step 2: Convert to fraction form
    307.80/462.31 = 279.25/x
  3. Step 3: Cross multiply
    307.80x = 462.31 × 279.25
  4. Step 4: Simplify right side
    307.80x = 129,098.21
  5. Step 5: Solve for x
    x = 129,098.21/307.80
  6. Step 6: Final answer
    x = 419.42

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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.