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Finding the Fourth Proportional to 157,879.28, 217,876.55 and 86,263.74

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Solution

The fourth proportional to 157,879.28, 217,876.55 and 86,263.74 is: 119,045.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,879.28 : 217,876.55 = 86,263.74 : x
  2. Step 2: Convert to fraction form
    157,879.28/217,876.55 = 86,263.74/x
  3. Step 3: Cross multiply
    157,879.28x = 217,876.55 × 86,263.74
  4. Step 4: Simplify right side
    157,879.28x = 18,794,845,629.98
  5. Step 5: Solve for x
    x = 18,794,845,629.98/157,879.28
  6. Step 6: Final answer
    x = 119,045.68

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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.