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Finding the Fourth Proportional to 12,239.65, 16,890.43 and 7,136.11

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Solution

The fourth proportional to 12,239.65, 16,890.43 and 7,136.11 is: 9,847.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,239.65 : 16,890.43 = 7,136.11 : x
  2. Step 2: Convert to fraction form
    12,239.65/16,890.43 = 7,136.11/x
  3. Step 3: Cross multiply
    12,239.65x = 16,890.43 × 7,136.11
  4. Step 4: Simplify right side
    12,239.65x = 120,531,966.43
  5. Step 5: Solve for x
    x = 120,531,966.43/12,239.65
  6. Step 6: Final answer
    x = 9,847.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.