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Finding the Fourth Proportional to 128,090.70, 192,136.05 and 81,377.10

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Solution

The fourth proportional to 128,090.70, 192,136.05 and 81,377.10 is: 122,065.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,090.70 : 192,136.05 = 81,377.10 : x
  2. Step 2: Convert to fraction form
    128,090.70/192,136.05 = 81,377.10/x
  3. Step 3: Cross multiply
    128,090.70x = 192,136.05 × 81,377.10
  4. Step 4: Simplify right side
    128,090.70x = 15,635,474,554.46
  5. Step 5: Solve for x
    x = 15,635,474,554.46/128,090.70
  6. Step 6: Final answer
    x = 122,065.65

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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.