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Finding the Fourth Proportional to 342.25, 472.40 and 211.37

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Solution

The fourth proportional to 342.25, 472.40 and 211.37 is: 291.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.25 : 472.40 = 211.37 : x
  2. Step 2: Convert to fraction form
    342.25/472.40 = 211.37/x
  3. Step 3: Cross multiply
    342.25x = 472.40 × 211.37
  4. Step 4: Simplify right side
    342.25x = 99,851.19
  5. Step 5: Solve for x
    x = 99,851.19/342.25
  6. Step 6: Final answer
    x = 291.75

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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.