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Finding the Fourth Proportional to 612.12, 918.17 and 149.90

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Solution

The fourth proportional to 612.12, 918.17 and 149.90 is: 224.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.12 : 918.17 = 149.90 : x
  2. Step 2: Convert to fraction form
    612.12/918.17 = 149.90/x
  3. Step 3: Cross multiply
    612.12x = 918.17 × 149.90
  4. Step 4: Simplify right side
    612.12x = 137,633.68
  5. Step 5: Solve for x
    x = 137,633.68/612.12
  6. Step 6: Final answer
    x = 224.85

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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.