Home / 81,025.20-121,566.60-78,145.20

Finding the Fourth Proportional to 81,025.20, 121,566.60 and 78,145.20

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Solution

The fourth proportional to 81,025.20, 121,566.60 and 78,145.20 is: 117,245.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,025.20 : 121,566.60 = 78,145.20 : x
  2. Step 2: Convert to fraction form
    81,025.20/121,566.60 = 78,145.20/x
  3. Step 3: Cross multiply
    81,025.20x = 121,566.60 × 78,145.20
  4. Step 4: Simplify right side
    81,025.20x = 9,499,846,270.32
  5. Step 5: Solve for x
    x = 9,499,846,270.32/81,025.20
  6. Step 6: Final answer
    x = 117,245.58

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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.