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Finding the Fourth Proportional to 128,023.80, 192,035.70 and 81,329.40

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Solution

The fourth proportional to 128,023.80, 192,035.70 and 81,329.40 is: 121,994.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,023.80 : 192,035.70 = 81,329.40 : x
  2. Step 2: Convert to fraction form
    128,023.80/192,035.70 = 81,329.40/x
  3. Step 3: Cross multiply
    128,023.80x = 192,035.70 × 81,329.40
  4. Step 4: Simplify right side
    128,023.80x = 15,618,148,259.58
  5. Step 5: Solve for x
    x = 15,618,148,259.58/128,023.80
  6. Step 6: Final answer
    x = 121,994.10

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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.