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Finding the Fourth Proportional to 306.42, 457.64 and 251.70

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Solution

The fourth proportional to 306.42, 457.64 and 251.70 is: 375.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.42 : 457.64 = 251.70 : x
  2. Step 2: Convert to fraction form
    306.42/457.64 = 251.70/x
  3. Step 3: Cross multiply
    306.42x = 457.64 × 251.70
  4. Step 4: Simplify right side
    306.42x = 115,186.73
  5. Step 5: Solve for x
    x = 115,186.73/306.42
  6. Step 6: Final answer
    x = 375.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.