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Finding the Fourth Proportional to 138,620.94, 191,123.52 and 115,683.78

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Solution

The fourth proportional to 138,620.94, 191,123.52 and 115,683.78 is: 159,498.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,620.94 : 191,123.52 = 115,683.78 : x
  2. Step 2: Convert to fraction form
    138,620.94/191,123.52 = 115,683.78/x
  3. Step 3: Cross multiply
    138,620.94x = 191,123.52 × 115,683.78
  4. Step 4: Simplify right side
    138,620.94x = 22,109,891,240.51
  5. Step 5: Solve for x
    x = 22,109,891,240.51/138,620.94
  6. Step 6: Final answer
    x = 159,498.93

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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.