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Finding the Fourth Proportional to 128,019.20, 191,683.20 and 100,371.20

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Solution

The fourth proportional to 128,019.20, 191,683.20 and 100,371.20 is: 150,285.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,019.20 : 191,683.20 = 100,371.20 : x
  2. Step 2: Convert to fraction form
    128,019.20/191,683.20 = 100,371.20/x
  3. Step 3: Cross multiply
    128,019.20x = 191,683.20 × 100,371.20
  4. Step 4: Simplify right side
    128,019.20x = 19,239,472,803.84
  5. Step 5: Solve for x
    x = 19,239,472,803.84/128,019.20
  6. Step 6: Final answer
    x = 150,285.84

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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.