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Finding the Fourth Proportional to 8,665.74, 12,930.62 and 8,136.81

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Solution

The fourth proportional to 8,665.74, 12,930.62 and 8,136.81 is: 12,141.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,665.74 : 12,930.62 = 8,136.81 : x
  2. Step 2: Convert to fraction form
    8,665.74/12,930.62 = 8,136.81/x
  3. Step 3: Cross multiply
    8,665.74x = 12,930.62 × 8,136.81
  4. Step 4: Simplify right side
    8,665.74x = 105,213,957.44
  5. Step 5: Solve for x
    x = 105,213,957.44/8,665.74
  6. Step 6: Final answer
    x = 12,141.37

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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.