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Finding the Fourth Proportional to 307.65, 424.27 and 209.24

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Solution

The fourth proportional to 307.65, 424.27 and 209.24 is: 288.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.65 : 424.27 = 209.24 : x
  2. Step 2: Convert to fraction form
    307.65/424.27 = 209.24/x
  3. Step 3: Cross multiply
    307.65x = 424.27 × 209.24
  4. Step 4: Simplify right side
    307.65x = 88,774.25
  5. Step 5: Solve for x
    x = 88,774.25/307.65
  6. Step 6: Final answer
    x = 288.56

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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.