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Finding the Fourth Proportional to 8,601.90, 12,890.70 and 5,305.20

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Solution

The fourth proportional to 8,601.90, 12,890.70 and 5,305.20 is: 7,950.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,601.90 : 12,890.70 = 5,305.20 : x
  2. Step 2: Convert to fraction form
    8,601.90/12,890.70 = 5,305.20/x
  3. Step 3: Cross multiply
    8,601.90x = 12,890.70 × 5,305.20
  4. Step 4: Simplify right side
    8,601.90x = 68,387,741.64
  5. Step 5: Solve for x
    x = 68,387,741.64/8,601.90
  6. Step 6: Final answer
    x = 7,950.31

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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.