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Finding the Fourth Proportional to 217,278.78, 299,843.76 and 121,785.48

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Solution

The fourth proportional to 217,278.78, 299,843.76 and 121,785.48 is: 168,063.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,278.78 : 299,843.76 = 121,785.48 : x
  2. Step 2: Convert to fraction form
    217,278.78/299,843.76 = 121,785.48/x
  3. Step 3: Cross multiply
    217,278.78x = 299,843.76 × 121,785.48
  4. Step 4: Simplify right side
    217,278.78x = 36,516,616,236.60
  5. Step 5: Solve for x
    x = 36,516,616,236.60/217,278.78
  6. Step 6: Final answer
    x = 168,063.43

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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.