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Finding the Fourth Proportional to 128,422.80, 192,634.20 and 78,656.40

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Solution

The fourth proportional to 128,422.80, 192,634.20 and 78,656.40 is: 117,984.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,422.80 : 192,634.20 = 78,656.40 : x
  2. Step 2: Convert to fraction form
    128,422.80/192,634.20 = 78,656.40/x
  3. Step 3: Cross multiply
    128,422.80x = 192,634.20 × 78,656.40
  4. Step 4: Simplify right side
    128,422.80x = 15,151,912,688.88
  5. Step 5: Solve for x
    x = 15,151,912,688.88/128,422.80
  6. Step 6: Final answer
    x = 117,984.60

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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.