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Finding the Fourth Proportional to 247.18, 339.30 and 218.93

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Solution

The fourth proportional to 247.18, 339.30 and 218.93 is: 300.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.18 : 339.30 = 218.93 : x
  2. Step 2: Convert to fraction form
    247.18/339.30 = 218.93/x
  3. Step 3: Cross multiply
    247.18x = 339.30 × 218.93
  4. Step 4: Simplify right side
    247.18x = 74,282.95
  5. Step 5: Solve for x
    x = 74,282.95/247.18
  6. Step 6: Final answer
    x = 300.52

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.