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Finding the Fourth Proportional to 342.79, 472.85 and 218.35

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Solution

The fourth proportional to 342.79, 472.85 and 218.35 is: 301.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.79 : 472.85 = 218.35 : x
  2. Step 2: Convert to fraction form
    342.79/472.85 = 218.35/x
  3. Step 3: Cross multiply
    342.79x = 472.85 × 218.35
  4. Step 4: Simplify right side
    342.79x = 103,247.12
  5. Step 5: Solve for x
    x = 103,247.12/342.79
  6. Step 6: Final answer
    x = 301.19

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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.