Home / 138,728.87-191,446.73-81,356.51

Finding the Fourth Proportional to 138,728.87, 191,446.73 and 81,356.51

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Solution

The fourth proportional to 138,728.87, 191,446.73 and 81,356.51 is: 112,272.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,728.87 : 191,446.73 = 81,356.51 : x
  2. Step 2: Convert to fraction form
    138,728.87/191,446.73 = 81,356.51/x
  3. Step 3: Cross multiply
    138,728.87x = 191,446.73 × 81,356.51
  4. Step 4: Simplify right side
    138,728.87x = 15,575,438,850.28
  5. Step 5: Solve for x
    x = 15,575,438,850.28/138,728.87
  6. Step 6: Final answer
    x = 112,272.51

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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.