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Finding the Fourth Proportional to 138,450.67, 191,061.99 and 74,788.47

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Solution

The fourth proportional to 138,450.67, 191,061.99 and 74,788.47 is: 103,208.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,450.67 : 191,061.99 = 74,788.47 : x
  2. Step 2: Convert to fraction form
    138,450.67/191,061.99 = 74,788.47/x
  3. Step 3: Cross multiply
    138,450.67x = 191,061.99 × 74,788.47
  4. Step 4: Simplify right side
    138,450.67x = 14,289,233,907.26
  5. Step 5: Solve for x
    x = 14,289,233,907.26/138,450.67
  6. Step 6: Final answer
    x = 103,208.13

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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.