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Finding the Fourth Proportional to 12,393.09, 17,090.73 and 8,136.64

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Solution

The fourth proportional to 12,393.09, 17,090.73 and 8,136.64 is: 11,220.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,393.09 : 17,090.73 = 8,136.64 : x
  2. Step 2: Convert to fraction form
    12,393.09/17,090.73 = 8,136.64/x
  3. Step 3: Cross multiply
    12,393.09x = 17,090.73 × 8,136.64
  4. Step 4: Simplify right side
    12,393.09x = 139,061,117.35
  5. Step 5: Solve for x
    x = 139,061,117.35/12,393.09
  6. Step 6: Final answer
    x = 11,220.86

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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.