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Finding the Fourth Proportional to 936.63, 1,291.83 and 716.31

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Solution

The fourth proportional to 936.63, 1,291.83 and 716.31 is: 987.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.63 : 1,291.83 = 716.31 : x
  2. Step 2: Convert to fraction form
    936.63/1,291.83 = 716.31/x
  3. Step 3: Cross multiply
    936.63x = 1,291.83 × 716.31
  4. Step 4: Simplify right side
    936.63x = 925,350.75
  5. Step 5: Solve for x
    x = 925,350.75/936.63
  6. Step 6: Final answer
    x = 987.96

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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.