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Finding the Fourth Proportional to 190,412.20, 285,488.70 and 90,620.20

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Solution

The fourth proportional to 190,412.20, 285,488.70 and 90,620.20 is: 135,868.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    190,412.20 : 285,488.70 = 90,620.20 : x
  2. Step 2: Convert to fraction form
    190,412.20/285,488.70 = 90,620.20/x
  3. Step 3: Cross multiply
    190,412.20x = 285,488.70 × 90,620.20
  4. Step 4: Simplify right side
    190,412.20x = 25,871,043,091.74
  5. Step 5: Solve for x
    x = 25,871,043,091.74/190,412.20
  6. Step 6: Final answer
    x = 135,868.62

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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.