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Finding the Fourth Proportional to 378.32, 570.38 and 343.76

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Solution

The fourth proportional to 378.32, 570.38 and 343.76 is: 518.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.32 : 570.38 = 343.76 : x
  2. Step 2: Convert to fraction form
    378.32/570.38 = 343.76/x
  3. Step 3: Cross multiply
    378.32x = 570.38 × 343.76
  4. Step 4: Simplify right side
    378.32x = 196,073.83
  5. Step 5: Solve for x
    x = 196,073.83/378.32
  6. Step 6: Final answer
    x = 518.28

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.