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Finding the Fourth Proportional to 157,956.09, 217,978.87 and 86,336.07

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Solution

The fourth proportional to 157,956.09, 217,978.87 and 86,336.07 is: 119,143.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,956.09 : 217,978.87 = 86,336.07 : x
  2. Step 2: Convert to fraction form
    157,956.09/217,978.87 = 86,336.07/x
  3. Step 3: Cross multiply
    157,956.09x = 217,978.87 × 86,336.07
  4. Step 4: Simplify right side
    157,956.09x = 18,819,438,978.84
  5. Step 5: Solve for x
    x = 18,819,438,978.84/157,956.09
  6. Step 6: Final answer
    x = 119,143.48

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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.