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Finding the Fourth Proportional to 863.45, 1,295.31 and 286.19

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Solution

The fourth proportional to 863.45, 1,295.31 and 286.19 is: 429.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.45 : 1,295.31 = 286.19 : x
  2. Step 2: Convert to fraction form
    863.45/1,295.31 = 286.19/x
  3. Step 3: Cross multiply
    863.45x = 1,295.31 × 286.19
  4. Step 4: Simplify right side
    863.45x = 370,704.77
  5. Step 5: Solve for x
    x = 370,704.77/863.45
  6. Step 6: Final answer
    x = 429.33

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1.5x scale

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.