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Finding the Fourth Proportional to 342.88, 472.70 and 218.54

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Solution

The fourth proportional to 342.88, 472.70 and 218.54 is: 301.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.88 : 472.70 = 218.54 : x
  2. Step 2: Convert to fraction form
    342.88/472.70 = 218.54/x
  3. Step 3: Cross multiply
    342.88x = 472.70 × 218.54
  4. Step 4: Simplify right side
    342.88x = 103,303.86
  5. Step 5: Solve for x
    x = 103,303.86/342.88
  6. Step 6: Final answer
    x = 301.28

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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.