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Finding the Fourth Proportional to 218.09, 300.93 and 124.78

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Solution

The fourth proportional to 218.09, 300.93 and 124.78 is: 172.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.09 : 300.93 = 124.78 : x
  2. Step 2: Convert to fraction form
    218.09/300.93 = 124.78/x
  3. Step 3: Cross multiply
    218.09x = 300.93 × 124.78
  4. Step 4: Simplify right side
    218.09x = 37,550.05
  5. Step 5: Solve for x
    x = 37,550.05/218.09
  6. Step 6: Final answer
    x = 172.18

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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.