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Finding the Fourth Proportional to 808.25, 1,212.44 and 260.45

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Solution

The fourth proportional to 808.25, 1,212.44 and 260.45 is: 390.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.25 : 1,212.44 = 260.45 : x
  2. Step 2: Convert to fraction form
    808.25/1,212.44 = 260.45/x
  3. Step 3: Cross multiply
    808.25x = 1,212.44 × 260.45
  4. Step 4: Simplify right side
    808.25x = 315,772.63
  5. Step 5: Solve for x
    x = 315,772.63/808.25
  6. Step 6: Final answer
    x = 390.69

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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.