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Finding the Fourth Proportional to 2,151.84, 3,228.31 and 612.84

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Solution

The fourth proportional to 2,151.84, 3,228.31 and 612.84 is: 919.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,151.84 : 3,228.31 = 612.84 : x
  2. Step 2: Convert to fraction form
    2,151.84/3,228.31 = 612.84/x
  3. Step 3: Cross multiply
    2,151.84x = 3,228.31 × 612.84
  4. Step 4: Simplify right side
    2,151.84x = 1,978,446.93
  5. Step 5: Solve for x
    x = 1,978,446.93/2,151.84
  6. Step 6: Final answer
    x = 919.42

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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.