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Finding the Fourth Proportional to 936.54, 1,290.90 and 749.70

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Solution

The fourth proportional to 936.54, 1,290.90 and 749.70 is: 1,033.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.54 : 1,290.90 = 749.70 : x
  2. Step 2: Convert to fraction form
    936.54/1,290.90 = 749.70/x
  3. Step 3: Cross multiply
    936.54x = 1,290.90 × 749.70
  4. Step 4: Simplify right side
    936.54x = 967,787.73
  5. Step 5: Solve for x
    x = 967,787.73/936.54
  6. Step 6: Final answer
    x = 1,033.37

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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.