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Finding the Fourth Proportional to 863.31, 1,190.78 and 583.40

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Solution

The fourth proportional to 863.31, 1,190.78 and 583.40 is: 804.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.31 : 1,190.78 = 583.40 : x
  2. Step 2: Convert to fraction form
    863.31/1,190.78 = 583.40/x
  3. Step 3: Cross multiply
    863.31x = 1,190.78 × 583.40
  4. Step 4: Simplify right side
    863.31x = 694,701.66
  5. Step 5: Solve for x
    x = 694,701.66/863.31
  6. Step 6: Final answer
    x = 804.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.