Home / 81,395.11-121,895.82-70,372.63

Finding the Fourth Proportional to 81,395.11, 121,895.82 and 70,372.63

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Solution

The fourth proportional to 81,395.11, 121,895.82 and 70,372.63 is: 105,388.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,395.11 : 121,895.82 = 70,372.63 : x
  2. Step 2: Convert to fraction form
    81,395.11/121,895.82 = 70,372.63/x
  3. Step 3: Cross multiply
    81,395.11x = 121,895.82 × 70,372.63
  4. Step 4: Simplify right side
    81,395.11x = 8,578,129,591.78
  5. Step 5: Solve for x
    x = 8,578,129,591.78/81,395.11
  6. Step 6: Final answer
    x = 105,388.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.