Home / 128,112.30-192,168.45-100,118.70

Finding the Fourth Proportional to 128,112.30, 192,168.45 and 100,118.70

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Solution

The fourth proportional to 128,112.30, 192,168.45 and 100,118.70 is: 150,178.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,112.30 : 192,168.45 = 100,118.70 : x
  2. Step 2: Convert to fraction form
    128,112.30/192,168.45 = 100,118.70/x
  3. Step 3: Cross multiply
    128,112.30x = 192,168.45 × 100,118.70
  4. Step 4: Simplify right side
    128,112.30x = 19,239,655,395.02
  5. Step 5: Solve for x
    x = 19,239,655,395.02/128,112.30
  6. Step 6: Final answer
    x = 150,178.05

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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.