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Finding the Fourth Proportional to 308.72, 424.76 and 234.60

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Solution

The fourth proportional to 308.72, 424.76 and 234.60 is: 322.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.72 : 424.76 = 234.60 : x
  2. Step 2: Convert to fraction form
    308.72/424.76 = 234.60/x
  3. Step 3: Cross multiply
    308.72x = 424.76 × 234.60
  4. Step 4: Simplify right side
    308.72x = 99,647.52
  5. Step 5: Solve for x
    x = 99,647.52/308.72
  6. Step 6: Final answer
    x = 322.78

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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.