Home / 81,399.12-121,901.82-70,376.64

Finding the Fourth Proportional to 81,399.12, 121,901.82 and 70,376.64

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Solution

The fourth proportional to 81,399.12, 121,901.82 and 70,376.64 is: 105,394.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,399.12 : 121,901.82 = 70,376.64 : x
  2. Step 2: Convert to fraction form
    81,399.12/121,901.82 = 70,376.64/x
  3. Step 3: Cross multiply
    81,399.12x = 121,901.82 × 70,376.64
  4. Step 4: Simplify right side
    81,399.12x = 8,579,040,501.48
  5. Step 5: Solve for x
    x = 8,579,040,501.48/81,399.12
  6. Step 6: Final answer
    x = 105,394.76

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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.