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Finding the Fourth Proportional to 611.78, 917.66 and 149.55

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Solution

The fourth proportional to 611.78, 917.66 and 149.55 is: 224.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.78 : 917.66 = 149.55 : x
  2. Step 2: Convert to fraction form
    611.78/917.66 = 149.55/x
  3. Step 3: Cross multiply
    611.78x = 917.66 × 149.55
  4. Step 4: Simplify right side
    611.78x = 137,236.05
  5. Step 5: Solve for x
    x = 137,236.05/611.78
  6. Step 6: Final answer
    x = 224.32

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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.