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Finding the Fourth Proportional to 20,896.40, 31,344.60 and 7,747.40

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Solution

The fourth proportional to 20,896.40, 31,344.60 and 7,747.40 is: 11,621.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,896.40 : 31,344.60 = 7,747.40 : x
  2. Step 2: Convert to fraction form
    20,896.40/31,344.60 = 7,747.40/x
  3. Step 3: Cross multiply
    20,896.40x = 31,344.60 × 7,747.40
  4. Step 4: Simplify right side
    20,896.40x = 242,839,154.04
  5. Step 5: Solve for x
    x = 242,839,154.04/20,896.40
  6. Step 6: Final answer
    x = 11,621.10

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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.