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Finding the Fourth Proportional to 343.78, 515.24 and 148.72

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Solution

The fourth proportional to 343.78, 515.24 and 148.72 is: 222.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.78 : 515.24 = 148.72 : x
  2. Step 2: Convert to fraction form
    343.78/515.24 = 148.72/x
  3. Step 3: Cross multiply
    343.78x = 515.24 × 148.72
  4. Step 4: Simplify right side
    343.78x = 76,626.49
  5. Step 5: Solve for x
    x = 76,626.49/343.78
  6. Step 6: Final answer
    x = 222.89

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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.