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Finding the Fourth Proportional to 128,447.80, 192,671.70 and 106,329.40

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Solution

The fourth proportional to 128,447.80, 192,671.70 and 106,329.40 is: 159,494.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,447.80 : 192,671.70 = 106,329.40 : x
  2. Step 2: Convert to fraction form
    128,447.80/192,671.70 = 106,329.40/x
  3. Step 3: Cross multiply
    128,447.80x = 192,671.70 × 106,329.40
  4. Step 4: Simplify right side
    128,447.80x = 20,486,666,257.98
  5. Step 5: Solve for x
    x = 20,486,666,257.98/128,447.80
  6. Step 6: Final answer
    x = 159,494.10

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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.