Home / 81,379.32-121,970.42-34,533.78

Finding the Fourth Proportional to 81,379.32, 121,970.42 and 34,533.78

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Solution

The fourth proportional to 81,379.32, 121,970.42 and 34,533.78 is: 51,758.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,379.32 : 121,970.42 = 34,533.78 : x
  2. Step 2: Convert to fraction form
    81,379.32/121,970.42 = 34,533.78/x
  3. Step 3: Cross multiply
    81,379.32x = 121,970.42 × 34,533.78
  4. Step 4: Simplify right side
    81,379.32x = 4,212,099,650.79
  5. Step 5: Solve for x
    x = 4,212,099,650.79/81,379.32
  6. Step 6: Final answer
    x = 51,758.85

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1.5x scale

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.