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Finding the Fourth Proportional to 128,540.68, 192,820.20 and 39,782.80

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Solution

The fourth proportional to 128,540.68, 192,820.20 and 39,782.80 is: 59,677.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,540.68 : 192,820.20 = 39,782.80 : x
  2. Step 2: Convert to fraction form
    128,540.68/192,820.20 = 39,782.80/x
  3. Step 3: Cross multiply
    128,540.68x = 192,820.20 × 39,782.80
  4. Step 4: Simplify right side
    128,540.68x = 7,670,927,452.56
  5. Step 5: Solve for x
    x = 7,670,927,452.56/128,540.68
  6. Step 6: Final answer
    x = 59,677.04

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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.