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Finding the Fourth Proportional to 128,259.45, 192,221.40 and 68,967.45

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Solution

The fourth proportional to 128,259.45, 192,221.40 and 68,967.45 is: 103,360.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,259.45 : 192,221.40 = 68,967.45 : x
  2. Step 2: Convert to fraction form
    128,259.45/192,221.40 = 68,967.45/x
  3. Step 3: Cross multiply
    128,259.45x = 192,221.40 × 68,967.45
  4. Step 4: Simplify right side
    128,259.45x = 13,257,019,793.43
  5. Step 5: Solve for x
    x = 13,257,019,793.43/128,259.45
  6. Step 6: Final answer
    x = 103,360.96

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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.