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Finding the Fourth Proportional to 806.68, 1,209.76 and 258.73

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Solution

The fourth proportional to 806.68, 1,209.76 and 258.73 is: 388.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.68 : 1,209.76 = 258.73 : x
  2. Step 2: Convert to fraction form
    806.68/1,209.76 = 258.73/x
  3. Step 3: Cross multiply
    806.68x = 1,209.76 × 258.73
  4. Step 4: Simplify right side
    806.68x = 312,997.53
  5. Step 5: Solve for x
    x = 312,997.53/806.68
  6. Step 6: Final answer
    x = 388.01

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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.