Home / 128,215.60-192,323.40-57,138.10

Finding the Fourth Proportional to 128,215.60, 192,323.40 and 57,138.10

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Solution

The fourth proportional to 128,215.60, 192,323.40 and 57,138.10 is: 85,707.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,215.60 : 192,323.40 = 57,138.10 : x
  2. Step 2: Convert to fraction form
    128,215.60/192,323.40 = 57,138.10/x
  3. Step 3: Cross multiply
    128,215.60x = 192,323.40 × 57,138.10
  4. Step 4: Simplify right side
    128,215.60x = 10,988,993,661.54
  5. Step 5: Solve for x
    x = 10,988,993,661.54/128,215.60
  6. Step 6: Final answer
    x = 85,707.15

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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.