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Finding the Fourth Proportional to 343.69, 474.59 and 256.21

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Solution

The fourth proportional to 343.69, 474.59 and 256.21 is: 353.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.69 : 474.59 = 256.21 : x
  2. Step 2: Convert to fraction form
    343.69/474.59 = 256.21/x
  3. Step 3: Cross multiply
    343.69x = 474.59 × 256.21
  4. Step 4: Simplify right side
    343.69x = 121,594.16
  5. Step 5: Solve for x
    x = 121,594.16/343.69
  6. Step 6: Final answer
    x = 353.79

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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.