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Finding the Fourth Proportional to 218, 300.90 and 124.80

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Solution

The fourth proportional to 218, 300.90 and 124.80 is: 172.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    218 : 300.90 = 124.80 : x
  2. Step 2: Convert to fraction form
    218/300.90 = 124.80/x
  3. Step 3: Cross multiply
    218x = 300.90 × 124.80
  4. Step 4: Simplify right side
    218x = 37,550.82
  5. Step 5: Solve for x
    x = 37,550.82/218
  6. Step 6: Final answer
    x = 172.25

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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.