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Finding the Fourth Proportional to 8,305.80, 12,458.70 and 7,212.30

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Solution

The fourth proportional to 8,305.80, 12,458.70 and 7,212.30 is: 10,818.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,305.80 : 12,458.70 = 7,212.30 : x
  2. Step 2: Convert to fraction form
    8,305.80/12,458.70 = 7,212.30/x
  3. Step 3: Cross multiply
    8,305.80x = 12,458.70 × 7,212.30
  4. Step 4: Simplify right side
    8,305.80x = 89,855,882.01
  5. Step 5: Solve for x
    x = 89,855,882.01/8,305.80
  6. Step 6: Final answer
    x = 10,818.45

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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.