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Finding the Fourth Proportional to 342.26, 472.71 and 312.68

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Solution

The fourth proportional to 342.26, 472.71 and 312.68 is: 431.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.26 : 472.71 = 312.68 : x
  2. Step 2: Convert to fraction form
    342.26/472.71 = 312.68/x
  3. Step 3: Cross multiply
    342.26x = 472.71 × 312.68
  4. Step 4: Simplify right side
    342.26x = 147,806.96
  5. Step 5: Solve for x
    x = 147,806.96/342.26
  6. Step 6: Final answer
    x = 431.86

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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.