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Finding the Fourth Proportional to 8,642.61, 12,889.49 and 8,487.09

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Solution

The fourth proportional to 8,642.61, 12,889.49 and 8,487.09 is: 12,657.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,642.61 : 12,889.49 = 8,487.09 : x
  2. Step 2: Convert to fraction form
    8,642.61/12,889.49 = 8,487.09/x
  3. Step 3: Cross multiply
    8,642.61x = 12,889.49 × 8,487.09
  4. Step 4: Simplify right side
    8,642.61x = 109,394,219.25
  5. Step 5: Solve for x
    x = 109,394,219.25/8,642.61
  6. Step 6: Final answer
    x = 12,657.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.