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Finding the Fourth Proportional to 307.26, 423.90 and 209.10

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Solution

The fourth proportional to 307.26, 423.90 and 209.10 is: 288.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.26 : 423.90 = 209.10 : x
  2. Step 2: Convert to fraction form
    307.26/423.90 = 209.10/x
  3. Step 3: Cross multiply
    307.26x = 423.90 × 209.10
  4. Step 4: Simplify right side
    307.26x = 88,637.49
  5. Step 5: Solve for x
    x = 88,637.49/307.26
  6. Step 6: Final answer
    x = 288.48

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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.