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Finding the Fourth Proportional to 307.80, 424.99 and 209.52

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Solution

The fourth proportional to 307.80, 424.99 and 209.52 is: 289.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.80 : 424.99 = 209.52 : x
  2. Step 2: Convert to fraction form
    307.80/424.99 = 209.52/x
  3. Step 3: Cross multiply
    307.80x = 424.99 × 209.52
  4. Step 4: Simplify right side
    307.80x = 89,043.90
  5. Step 5: Solve for x
    x = 89,043.90/307.80
  6. Step 6: Final answer
    x = 289.29

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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.