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Finding the Fourth Proportional to 8,260.65, 12,390.80 and 2,020.55

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Solution

The fourth proportional to 8,260.65, 12,390.80 and 2,020.55 is: 3,030.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,260.65 : 12,390.80 = 2,020.55 : x
  2. Step 2: Convert to fraction form
    8,260.65/12,390.80 = 2,020.55/x
  3. Step 3: Cross multiply
    8,260.65x = 12,390.80 × 2,020.55
  4. Step 4: Simplify right side
    8,260.65x = 25,036,158.88
  5. Step 5: Solve for x
    x = 25,036,158.88/8,260.65
  6. Step 6: Final answer
    x = 3,030.77

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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.