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Finding the Fourth Proportional to 412.56, 618.71 and 193.11

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Solution

The fourth proportional to 412.56, 618.71 and 193.11 is: 289.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.56 : 618.71 = 193.11 : x
  2. Step 2: Convert to fraction form
    412.56/618.71 = 193.11/x
  3. Step 3: Cross multiply
    412.56x = 618.71 × 193.11
  4. Step 4: Simplify right side
    412.56x = 119,479.09
  5. Step 5: Solve for x
    x = 119,479.09/412.56
  6. Step 6: Final answer
    x = 289.61

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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.