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Finding the Fourth Proportional to 308.50, 423.61 and 261.72

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Solution

The fourth proportional to 308.50, 423.61 and 261.72 is: 359.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.50 : 423.61 = 261.72 : x
  2. Step 2: Convert to fraction form
    308.50/423.61 = 261.72/x
  3. Step 3: Cross multiply
    308.50x = 423.61 × 261.72
  4. Step 4: Simplify right side
    308.50x = 110,866.55
  5. Step 5: Solve for x
    x = 110,866.55/308.50
  6. Step 6: Final answer
    x = 359.38

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.