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Finding the Fourth Proportional to 612.24, 919.22 and 393.81

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Solution

The fourth proportional to 612.24, 919.22 and 393.81 is: 591.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.24 : 919.22 = 393.81 : x
  2. Step 2: Convert to fraction form
    612.24/919.22 = 393.81/x
  3. Step 3: Cross multiply
    612.24x = 919.22 × 393.81
  4. Step 4: Simplify right side
    612.24x = 361,996.06
  5. Step 5: Solve for x
    x = 361,996.06/612.24
  6. Step 6: Final answer
    x = 591.26

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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.