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Finding the Fourth Proportional to 138,445.79, 191,102.65 and 81,103.50

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Solution

The fourth proportional to 138,445.79, 191,102.65 and 81,103.50 is: 111,950.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,445.79 : 191,102.65 = 81,103.50 : x
  2. Step 2: Convert to fraction form
    138,445.79/191,102.65 = 81,103.50/x
  3. Step 3: Cross multiply
    138,445.79x = 191,102.65 × 81,103.50
  4. Step 4: Simplify right side
    138,445.79x = 15,499,093,571.52
  5. Step 5: Solve for x
    x = 15,499,093,571.52/138,445.79
  6. Step 6: Final answer
    x = 111,950.64

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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.