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Finding the Fourth Proportional to 612.78, 919.13 and 179.90

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Solution

The fourth proportional to 612.78, 919.13 and 179.90 is: 269.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.78 : 919.13 = 179.90 : x
  2. Step 2: Convert to fraction form
    612.78/919.13 = 179.90/x
  3. Step 3: Cross multiply
    612.78x = 919.13 × 179.90
  4. Step 4: Simplify right side
    612.78x = 165,351.49
  5. Step 5: Solve for x
    x = 165,351.49/612.78
  6. Step 6: Final answer
    x = 269.84

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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.