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Finding the Fourth Proportional to 808.22, 1,212.06 and 260.27

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Solution

The fourth proportional to 808.22, 1,212.06 and 260.27 is: 390.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.22 : 1,212.06 = 260.27 : x
  2. Step 2: Convert to fraction form
    808.22/1,212.06 = 260.27/x
  3. Step 3: Cross multiply
    808.22x = 1,212.06 × 260.27
  4. Step 4: Simplify right side
    808.22x = 315,462.86
  5. Step 5: Solve for x
    x = 315,462.86/808.22
  6. Step 6: Final answer
    x = 390.32

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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.