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Finding the Fourth Proportional to 128,085.60, 192,128.40 and 120,698.40

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Solution

The fourth proportional to 128,085.60, 192,128.40 and 120,698.40 is: 181,047.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,085.60 : 192,128.40 = 120,698.40 : x
  2. Step 2: Convert to fraction form
    128,085.60/192,128.40 = 120,698.40/x
  3. Step 3: Cross multiply
    128,085.60x = 192,128.40 × 120,698.40
  4. Step 4: Simplify right side
    128,085.60x = 23,189,590,474.56
  5. Step 5: Solve for x
    x = 23,189,590,474.56/128,085.60
  6. Step 6: Final answer
    x = 181,047.60

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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.