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Finding the Fourth Proportional to 20,687.20, 31,059.60 and 12,911.20

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Solution

The fourth proportional to 20,687.20, 31,059.60 and 12,911.20 is: 19,384.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.20 : 31,059.60 = 12,911.20 : x
  2. Step 2: Convert to fraction form
    20,687.20/31,059.60 = 12,911.20/x
  3. Step 3: Cross multiply
    20,687.20x = 31,059.60 × 12,911.20
  4. Step 4: Simplify right side
    20,687.20x = 401,016,707.52
  5. Step 5: Solve for x
    x = 401,016,707.52/20,687.20
  6. Step 6: Final answer
    x = 19,384.77

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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.