Home / 81,019.20-121,557.60-78,139.20

Finding the Fourth Proportional to 81,019.20, 121,557.60 and 78,139.20

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Solution

The fourth proportional to 81,019.20, 121,557.60 and 78,139.20 is: 117,236.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,019.20 : 121,557.60 = 78,139.20 : x
  2. Step 2: Convert to fraction form
    81,019.20/121,557.60 = 78,139.20/x
  3. Step 3: Cross multiply
    81,019.20x = 121,557.60 × 78,139.20
  4. Step 4: Simplify right side
    81,019.20x = 9,498,413,617.92
  5. Step 5: Solve for x
    x = 9,498,413,617.92/81,019.20
  6. Step 6: Final answer
    x = 117,236.58

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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.