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Finding the Fourth Proportional to 412.66, 618.94 and 120.15

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Solution

The fourth proportional to 412.66, 618.94 and 120.15 is: 180.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.66 : 618.94 = 120.15 : x
  2. Step 2: Convert to fraction form
    412.66/618.94 = 120.15/x
  3. Step 3: Cross multiply
    412.66x = 618.94 × 120.15
  4. Step 4: Simplify right side
    412.66x = 74,365.79
  5. Step 5: Solve for x
    x = 74,365.79/412.66
  6. Step 6: Final answer
    x = 180.21

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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.