Home / 138,480.40-191,101.98-81,890.56

Finding the Fourth Proportional to 138,480.40, 191,101.98 and 81,890.56

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Solution

The fourth proportional to 138,480.40, 191,101.98 and 81,890.56 is: 113,008.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,480.40 : 191,101.98 = 81,890.56 : x
  2. Step 2: Convert to fraction form
    138,480.40/191,101.98 = 81,890.56/x
  3. Step 3: Cross multiply
    138,480.40x = 191,101.98 × 81,890.56
  4. Step 4: Simplify right side
    138,480.40x = 15,649,448,159.31
  5. Step 5: Solve for x
    x = 15,649,448,159.31/138,480.40
  6. Step 6: Final answer
    x = 113,008.40

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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.