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Finding the Fourth Proportional to 307.20, 423.99 and 209.06

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Solution

The fourth proportional to 307.20, 423.99 and 209.06 is: 288.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.20 : 423.99 = 209.06 : x
  2. Step 2: Convert to fraction form
    307.20/423.99 = 209.06/x
  3. Step 3: Cross multiply
    307.20x = 423.99 × 209.06
  4. Step 4: Simplify right side
    307.20x = 88,637.23
  5. Step 5: Solve for x
    x = 88,637.23/307.20
  6. Step 6: Final answer
    x = 288.53

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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.