Home / 20,970.78-31,451.85-9,276.54

Finding the Fourth Proportional to 20,970.78, 31,451.85 and 9,276.54

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Solution

The fourth proportional to 20,970.78, 31,451.85 and 9,276.54 is: 13,912.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,970.78 : 31,451.85 = 9,276.54 : x
  2. Step 2: Convert to fraction form
    20,970.78/31,451.85 = 9,276.54/x
  3. Step 3: Cross multiply
    20,970.78x = 31,451.85 × 9,276.54
  4. Step 4: Simplify right side
    20,970.78x = 291,764,344.60
  5. Step 5: Solve for x
    x = 291,764,344.60/20,970.78
  6. Step 6: Final answer
    x = 13,912.90

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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.