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Finding the Fourth Proportional to 342.79, 472.79 and 218.32

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Solution

The fourth proportional to 342.79, 472.79 and 218.32 is: 301.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.79 : 472.79 = 218.32 : x
  2. Step 2: Convert to fraction form
    342.79/472.79 = 218.32/x
  3. Step 3: Cross multiply
    342.79x = 472.79 × 218.32
  4. Step 4: Simplify right side
    342.79x = 103,218.88
  5. Step 5: Solve for x
    x = 103,218.88/342.79
  6. Step 6: Final answer
    x = 301.12

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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.