Home / 81,331.80-121,940.10-31,392.60

Finding the Fourth Proportional to 81,331.80, 121,940.10 and 31,392.60

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Solution

The fourth proportional to 81,331.80, 121,940.10 and 31,392.60 is: 47,066.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,331.80 : 121,940.10 = 31,392.60 : x
  2. Step 2: Convert to fraction form
    81,331.80/121,940.10 = 31,392.60/x
  3. Step 3: Cross multiply
    81,331.80x = 121,940.10 × 31,392.60
  4. Step 4: Simplify right side
    81,331.80x = 3,828,016,783.26
  5. Step 5: Solve for x
    x = 3,828,016,783.26/81,331.80
  6. Step 6: Final answer
    x = 47,066.67

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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.