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Finding the Fourth Proportional to 307.31, 423.99 and 208.89

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Solution

The fourth proportional to 307.31, 423.99 and 208.89 is: 288.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.31 : 423.99 = 208.89 : x
  2. Step 2: Convert to fraction form
    307.31/423.99 = 208.89/x
  3. Step 3: Cross multiply
    307.31x = 423.99 × 208.89
  4. Step 4: Simplify right side
    307.31x = 88,567.27
  5. Step 5: Solve for x
    x = 88,567.27/307.31
  6. Step 6: Final answer
    x = 288.21

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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.