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Finding the Fourth Proportional to 157,659.40, 217,570.74 and 86,040.91

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Solution

The fourth proportional to 157,659.40, 217,570.74 and 86,040.91 is: 118,736.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,659.40 : 217,570.74 = 86,040.91 : x
  2. Step 2: Convert to fraction form
    157,659.40/217,570.74 = 86,040.91/x
  3. Step 3: Cross multiply
    157,659.40x = 217,570.74 × 86,040.91
  4. Step 4: Simplify right side
    157,659.40x = 18,719,984,458.97
  5. Step 5: Solve for x
    x = 18,719,984,458.97/157,659.40
  6. Step 6: Final answer
    x = 118,736.87

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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.