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Finding the Fourth Proportional to 128,021.20, 191,686.20 and 100,373.20

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Solution

The fourth proportional to 128,021.20, 191,686.20 and 100,373.20 is: 150,288.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,021.20 : 191,686.20 = 100,373.20 : x
  2. Step 2: Convert to fraction form
    128,021.20/191,686.20 = 100,373.20/x
  3. Step 3: Cross multiply
    128,021.20x = 191,686.20 × 100,373.20
  4. Step 4: Simplify right side
    128,021.20x = 19,240,157,289.84
  5. Step 5: Solve for x
    x = 19,240,157,289.84/128,021.20
  6. Step 6: Final answer
    x = 150,288.84

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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.