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Finding the Fourth Proportional to 128,311.82, 192,455.34 and 39,541.49

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Solution

The fourth proportional to 128,311.82, 192,455.34 and 39,541.49 is: 59,308.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,311.82 : 192,455.34 = 39,541.49 : x
  2. Step 2: Convert to fraction form
    128,311.82/192,455.34 = 39,541.49/x
  3. Step 3: Cross multiply
    128,311.82x = 192,455.34 × 39,541.49
  4. Step 4: Simplify right side
    128,311.82x = 7,609,969,939.78
  5. Step 5: Solve for x
    x = 7,609,969,939.78/128,311.82
  6. Step 6: Final answer
    x = 59,308.41

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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.