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Finding the Fourth Proportional to 1,293.76, 1,785.90 and 994.42

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Solution

The fourth proportional to 1,293.76, 1,785.90 and 994.42 is: 1,372.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,293.76 : 1,785.90 = 994.42 : x
  2. Step 2: Convert to fraction form
    1,293.76/1,785.90 = 994.42/x
  3. Step 3: Cross multiply
    1,293.76x = 1,785.90 × 994.42
  4. Step 4: Simplify right side
    1,293.76x = 1,775,934.68
  5. Step 5: Solve for x
    x = 1,775,934.68/1,293.76
  6. Step 6: Final answer
    x = 1,372.69

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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.