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Finding the Fourth Proportional to 13,136.72, 18,129 and 7,168.48

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Solution

The fourth proportional to 13,136.72, 18,129 and 7,168.48 is: 9,892.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,136.72 : 18,129 = 7,168.48 : x
  2. Step 2: Convert to fraction form
    13,136.72/18,129 = 7,168.48/x
  3. Step 3: Cross multiply
    13,136.72x = 18,129 × 7,168.48
  4. Step 4: Simplify right side
    13,136.72x = 129,957,373.92
  5. Step 5: Solve for x
    x = 129,957,373.92/13,136.72
  6. Step 6: Final answer
    x = 9,892.68

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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.