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Finding the Fourth Proportional to 936.91, 1,292.81 and 563.98

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Solution

The fourth proportional to 936.91, 1,292.81 and 563.98 is: 778.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.91 : 1,292.81 = 563.98 : x
  2. Step 2: Convert to fraction form
    936.91/1,292.81 = 563.98/x
  3. Step 3: Cross multiply
    936.91x = 1,292.81 × 563.98
  4. Step 4: Simplify right side
    936.91x = 729,112.93
  5. Step 5: Solve for x
    x = 729,112.93/936.91
  6. Step 6: Final answer
    x = 778.21

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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.