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Finding the Fourth Proportional to 306.60, 422.40 and 251.52

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Solution

The fourth proportional to 306.60, 422.40 and 251.52 is: 346.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.60 : 422.40 = 251.52 : x
  2. Step 2: Convert to fraction form
    306.60/422.40 = 251.52/x
  3. Step 3: Cross multiply
    306.60x = 422.40 × 251.52
  4. Step 4: Simplify right side
    306.60x = 106,242.05
  5. Step 5: Solve for x
    x = 106,242.05/306.60
  6. Step 6: Final answer
    x = 346.52

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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.