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Finding the Fourth Proportional to 412.22, 618.40 and 206.74

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Solution

The fourth proportional to 412.22, 618.40 and 206.74 is: 310.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.22 : 618.40 = 206.74 : x
  2. Step 2: Convert to fraction form
    412.22/618.40 = 206.74/x
  3. Step 3: Cross multiply
    412.22x = 618.40 × 206.74
  4. Step 4: Simplify right side
    412.22x = 127,848.02
  5. Step 5: Solve for x
    x = 127,848.02/412.22
  6. Step 6: Final answer
    x = 310.15

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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.