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Finding the Fourth Proportional to 217,443.78, 300,087.40 and 121,956.63

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Solution

The fourth proportional to 217,443.78, 300,087.40 and 121,956.63 is: 168,308.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,443.78 : 300,087.40 = 121,956.63 : x
  2. Step 2: Convert to fraction form
    217,443.78/300,087.40 = 121,956.63/x
  3. Step 3: Cross multiply
    217,443.78x = 300,087.40 × 121,956.63
  4. Step 4: Simplify right side
    217,443.78x = 36,597,648,009.46
  5. Step 5: Solve for x
    x = 36,597,648,009.46/217,443.78
  6. Step 6: Final answer
    x = 168,308.55

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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.