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Finding the Fourth Proportional to 128,136.30, 192,204.45 and 81,480.30

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Solution

The fourth proportional to 128,136.30, 192,204.45 and 81,480.30 is: 122,220.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,136.30 : 192,204.45 = 81,480.30 : x
  2. Step 2: Convert to fraction form
    128,136.30/192,204.45 = 81,480.30/x
  3. Step 3: Cross multiply
    128,136.30x = 192,204.45 × 81,480.30
  4. Step 4: Simplify right side
    128,136.30x = 15,660,876,247.34
  5. Step 5: Solve for x
    x = 15,660,876,247.34/128,136.30
  6. Step 6: Final answer
    x = 122,220.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.