Home / 128,083.20-192,124.80-81,369.60

Finding the Fourth Proportional to 128,083.20, 192,124.80 and 81,369.60

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Solution

The fourth proportional to 128,083.20, 192,124.80 and 81,369.60 is: 122,054.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,083.20 : 192,124.80 = 81,369.60 : x
  2. Step 2: Convert to fraction form
    128,083.20/192,124.80 = 81,369.60/x
  3. Step 3: Cross multiply
    128,083.20x = 192,124.80 × 81,369.60
  4. Step 4: Simplify right side
    128,083.20x = 15,633,118,126.08
  5. Step 5: Solve for x
    x = 15,633,118,126.08/128,083.20
  6. Step 6: Final answer
    x = 122,054.40

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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.