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Finding the Fourth Proportional to 863.60, 1,289.07 and 790.55

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Solution

The fourth proportional to 863.60, 1,289.07 and 790.55 is: 1,180.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.60 : 1,289.07 = 790.55 : x
  2. Step 2: Convert to fraction form
    863.60/1,289.07 = 790.55/x
  3. Step 3: Cross multiply
    863.60x = 1,289.07 × 790.55
  4. Step 4: Simplify right side
    863.60x = 1,019,067.84
  5. Step 5: Solve for x
    x = 1,019,067.84/863.60
  6. Step 6: Final answer
    x = 1,180.03

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.