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Finding the Fourth Proportional to 412.86, 618.61 and 207.22

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Solution

The fourth proportional to 412.86, 618.61 and 207.22 is: 310.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.86 : 618.61 = 207.22 : x
  2. Step 2: Convert to fraction form
    412.86/618.61 = 207.22/x
  3. Step 3: Cross multiply
    412.86x = 618.61 × 207.22
  4. Step 4: Simplify right side
    412.86x = 128,188.36
  5. Step 5: Solve for x
    x = 128,188.36/412.86
  6. Step 6: Final answer
    x = 310.49

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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.