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Finding the Fourth Proportional to 8,711.20, 13,045.20 and 6,983.20

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Solution

The fourth proportional to 8,711.20, 13,045.20 and 6,983.20 is: 10,457.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,711.20 : 13,045.20 = 6,983.20 : x
  2. Step 2: Convert to fraction form
    8,711.20/13,045.20 = 6,983.20/x
  3. Step 3: Cross multiply
    8,711.20x = 13,045.20 × 6,983.20
  4. Step 4: Simplify right side
    8,711.20x = 91,097,240.64
  5. Step 5: Solve for x
    x = 91,097,240.64/8,711.20
  6. Step 6: Final answer
    x = 10,457.48

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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.