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Finding the Fourth Proportional to 936.39, 1,291.81 and 687.27

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Solution

The fourth proportional to 936.39, 1,291.81 and 687.27 is: 948.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.39 : 1,291.81 = 687.27 : x
  2. Step 2: Convert to fraction form
    936.39/1,291.81 = 687.27/x
  3. Step 3: Cross multiply
    936.39x = 1,291.81 × 687.27
  4. Step 4: Simplify right side
    936.39x = 887,822.26
  5. Step 5: Solve for x
    x = 887,822.26/936.39
  6. Step 6: Final answer
    x = 948.13

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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.