Home / 81,245.40-121,328.26-80,365.74

Finding the Fourth Proportional to 81,245.40, 121,328.26 and 80,365.74

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Solution

The fourth proportional to 81,245.40, 121,328.26 and 80,365.74 is: 120,014.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,245.40 : 121,328.26 = 80,365.74 : x
  2. Step 2: Convert to fraction form
    81,245.40/121,328.26 = 80,365.74/x
  3. Step 3: Cross multiply
    81,245.40x = 121,328.26 × 80,365.74
  4. Step 4: Simplify right side
    81,245.40x = 9,750,635,193.97
  5. Step 5: Solve for x
    x = 9,750,635,193.97/81,245.40
  6. Step 6: Final answer
    x = 120,014.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.