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Finding the Fourth Proportional to 936.43, 1,290.99 and 907.72

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Solution

The fourth proportional to 936.43, 1,290.99 and 907.72 is: 1,251.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.43 : 1,290.99 = 907.72 : x
  2. Step 2: Convert to fraction form
    936.43/1,290.99 = 907.72/x
  3. Step 3: Cross multiply
    936.43x = 1,290.99 × 907.72
  4. Step 4: Simplify right side
    936.43x = 1,171,857.44
  5. Step 5: Solve for x
    x = 1,171,857.44/936.43
  6. Step 6: Final answer
    x = 1,251.41

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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.