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Finding the Fourth Proportional to 808.66, 1,212.99 and 260.86

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Solution

The fourth proportional to 808.66, 1,212.99 and 260.86 is: 391.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.66 : 1,212.99 = 260.86 : x
  2. Step 2: Convert to fraction form
    808.66/1,212.99 = 260.86/x
  3. Step 3: Cross multiply
    808.66x = 1,212.99 × 260.86
  4. Step 4: Simplify right side
    808.66x = 316,414.51
  5. Step 5: Solve for x
    x = 316,414.51/808.66
  6. Step 6: Final answer
    x = 391.28

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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.