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Finding the Fourth Proportional to 138,450.30, 191,061.30 and 74,788.08

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Solution

The fourth proportional to 138,450.30, 191,061.30 and 74,788.08 is: 103,207.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,450.30 : 191,061.30 = 74,788.08 : x
  2. Step 2: Convert to fraction form
    138,450.30/191,061.30 = 74,788.08/x
  3. Step 3: Cross multiply
    138,450.30x = 191,061.30 × 74,788.08
  4. Step 4: Simplify right side
    138,450.30x = 14,289,107,789.30
  5. Step 5: Solve for x
    x = 14,289,107,789.30/138,450.30
  6. Step 6: Final answer
    x = 103,207.49

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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.