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Finding the Fourth Proportional to 306.50, 423.59 and 251.15

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Solution

The fourth proportional to 306.50, 423.59 and 251.15 is: 347.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.50 : 423.59 = 251.15 : x
  2. Step 2: Convert to fraction form
    306.50/423.59 = 251.15/x
  3. Step 3: Cross multiply
    306.50x = 423.59 × 251.15
  4. Step 4: Simplify right side
    306.50x = 106,381.25
  5. Step 5: Solve for x
    x = 106,381.25/306.50
  6. Step 6: Final answer
    x = 347.09

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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.