Home / 80,678.40-121,039.20-71,973.60

Finding the Fourth Proportional to 80,678.40, 121,039.20 and 71,973.60

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Solution

The fourth proportional to 80,678.40, 121,039.20 and 71,973.60 is: 107,979.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,678.40 : 121,039.20 = 71,973.60 : x
  2. Step 2: Convert to fraction form
    80,678.40/121,039.20 = 71,973.60/x
  3. Step 3: Cross multiply
    80,678.40x = 121,039.20 × 71,973.60
  4. Step 4: Simplify right side
    80,678.40x = 8,711,626,965.12
  5. Step 5: Solve for x
    x = 8,711,626,965.12/80,678.40
  6. Step 6: Final answer
    x = 107,979.67

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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.