Home / 80,814.40-121,243.20-72,109.60

Finding the Fourth Proportional to 80,814.40, 121,243.20 and 72,109.60

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Solution

The fourth proportional to 80,814.40, 121,243.20 and 72,109.60 is: 108,183.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,814.40 : 121,243.20 = 72,109.60 : x
  2. Step 2: Convert to fraction form
    80,814.40/121,243.20 = 72,109.60/x
  3. Step 3: Cross multiply
    80,814.40x = 121,243.20 × 72,109.60
  4. Step 4: Simplify right side
    80,814.40x = 8,742,798,654.72
  5. Step 5: Solve for x
    x = 8,742,798,654.72/80,814.40
  6. Step 6: Final answer
    x = 108,183.67

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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.