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Finding the Fourth Proportional to 8,555.40, 12,821.10 and 6,803.40

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Solution

The fourth proportional to 8,555.40, 12,821.10 and 6,803.40 is: 10,195.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,555.40 : 12,821.10 = 6,803.40 : x
  2. Step 2: Convert to fraction form
    8,555.40/12,821.10 = 6,803.40/x
  3. Step 3: Cross multiply
    8,555.40x = 12,821.10 × 6,803.40
  4. Step 4: Simplify right side
    8,555.40x = 87,227,071.74
  5. Step 5: Solve for x
    x = 87,227,071.74/8,555.40
  6. Step 6: Final answer
    x = 10,195.56

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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.