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Finding the Fourth Proportional to 262.35, 392.88 and 218.61

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Solution

The fourth proportional to 262.35, 392.88 and 218.61 is: 327.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.35 : 392.88 = 218.61 : x
  2. Step 2: Convert to fraction form
    262.35/392.88 = 218.61/x
  3. Step 3: Cross multiply
    262.35x = 392.88 × 218.61
  4. Step 4: Simplify right side
    262.35x = 85,887.50
  5. Step 5: Solve for x
    x = 85,887.50/262.35
  6. Step 6: Final answer
    x = 327.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.