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Finding the Fourth Proportional to 936.68, 1,292.15 and 605.39

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Solution

The fourth proportional to 936.68, 1,292.15 and 605.39 is: 835.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.68 : 1,292.15 = 605.39 : x
  2. Step 2: Convert to fraction form
    936.68/1,292.15 = 605.39/x
  3. Step 3: Cross multiply
    936.68x = 1,292.15 × 605.39
  4. Step 4: Simplify right side
    936.68x = 782,249.74
  5. Step 5: Solve for x
    x = 782,249.74/936.68
  6. Step 6: Final answer
    x = 835.13

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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.