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Finding the Fourth Proportional to 936.35, 1,291.46 and 687.59

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Solution

The fourth proportional to 936.35, 1,291.46 and 687.59 is: 948.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.35 : 1,291.46 = 687.59 : x
  2. Step 2: Convert to fraction form
    936.35/1,291.46 = 687.59/x
  3. Step 3: Cross multiply
    936.35x = 1,291.46 × 687.59
  4. Step 4: Simplify right side
    936.35x = 887,994.98
  5. Step 5: Solve for x
    x = 887,994.98/936.35
  6. Step 6: Final answer
    x = 948.36

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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.