Home / 81,040.40-121,160.96-68,698.16

Finding the Fourth Proportional to 81,040.40, 121,160.96 and 68,698.16

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Solution

The fourth proportional to 81,040.40, 121,160.96 and 68,698.16 is: 102,708.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,040.40 : 121,160.96 = 68,698.16 : x
  2. Step 2: Convert to fraction form
    81,040.40/121,160.96 = 68,698.16/x
  3. Step 3: Cross multiply
    81,040.40x = 121,160.96 × 68,698.16
  4. Step 4: Simplify right side
    81,040.40x = 8,323,535,015.83
  5. Step 5: Solve for x
    x = 8,323,535,015.83/81,040.40
  6. Step 6: Final answer
    x = 102,708.46

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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.