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Finding the Fourth Proportional to 138,986.51, 191,801.34 and 75,324.31

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Solution

The fourth proportional to 138,986.51, 191,801.34 and 75,324.31 is: 103,947.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,986.51 : 191,801.34 = 75,324.31 : x
  2. Step 2: Convert to fraction form
    138,986.51/191,801.34 = 75,324.31/x
  3. Step 3: Cross multiply
    138,986.51x = 191,801.34 × 75,324.31
  4. Step 4: Simplify right side
    138,986.51x = 14,447,303,113.07
  5. Step 5: Solve for x
    x = 14,447,303,113.07/138,986.51
  6. Step 6: Final answer
    x = 103,947.52

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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.