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Finding the Fourth Proportional to 138,648.87, 191,335.43 and 74,986.67

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Solution

The fourth proportional to 138,648.87, 191,335.43 and 74,986.67 is: 103,481.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,648.87 : 191,335.43 = 74,986.67 : x
  2. Step 2: Convert to fraction form
    138,648.87/191,335.43 = 74,986.67/x
  3. Step 3: Cross multiply
    138,648.87x = 191,335.43 × 74,986.67
  4. Step 4: Simplify right side
    138,648.87x = 14,347,605,417.11
  5. Step 5: Solve for x
    x = 14,347,605,417.11/138,648.87
  6. Step 6: Final answer
    x = 103,481.59

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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.