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Finding the Fourth Proportional to 343.45, 515.20 and 148.46

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Solution

The fourth proportional to 343.45, 515.20 and 148.46 is: 222.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.45 : 515.20 = 148.46 : x
  2. Step 2: Convert to fraction form
    343.45/515.20 = 148.46/x
  3. Step 3: Cross multiply
    343.45x = 515.20 × 148.46
  4. Step 4: Simplify right side
    343.45x = 76,484.02
  5. Step 5: Solve for x
    x = 76,484.02/343.45
  6. Step 6: Final answer
    x = 222.69

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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.