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Finding the Fourth Proportional to 218.98, 302.15 and 140.31

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Solution

The fourth proportional to 218.98, 302.15 and 140.31 is: 193.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.98 : 302.15 = 140.31 : x
  2. Step 2: Convert to fraction form
    218.98/302.15 = 140.31/x
  3. Step 3: Cross multiply
    218.98x = 302.15 × 140.31
  4. Step 4: Simplify right side
    218.98x = 42,392.45
  5. Step 5: Solve for x
    x = 42,392.45/218.98
  6. Step 6: Final answer
    x = 193.59

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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.