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Finding the Fourth Proportional to 806.15, 1,209.38 and 258.29

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Solution

The fourth proportional to 806.15, 1,209.38 and 258.29 is: 387.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.15 : 1,209.38 = 258.29 : x
  2. Step 2: Convert to fraction form
    806.15/1,209.38 = 258.29/x
  3. Step 3: Cross multiply
    806.15x = 1,209.38 × 258.29
  4. Step 4: Simplify right side
    806.15x = 312,363.42
  5. Step 5: Solve for x
    x = 312,363.42/806.15
  6. Step 6: Final answer
    x = 387.48

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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.