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Finding the Fourth Proportional to 308.37, 462.45 and 91.89

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Solution

The fourth proportional to 308.37, 462.45 and 91.89 is: 137.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.37 : 462.45 = 91.89 : x
  2. Step 2: Convert to fraction form
    308.37/462.45 = 91.89/x
  3. Step 3: Cross multiply
    308.37x = 462.45 × 91.89
  4. Step 4: Simplify right side
    308.37x = 42,494.53
  5. Step 5: Solve for x
    x = 42,494.53/308.37
  6. Step 6: Final answer
    x = 137.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.