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Finding the Fourth Proportional to 67,321.40, 100,986.90 and 20,574.20

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Solution

The fourth proportional to 67,321.40, 100,986.90 and 20,574.20 is: 30,862.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,321.40 : 100,986.90 = 20,574.20 : x
  2. Step 2: Convert to fraction form
    67,321.40/100,986.90 = 20,574.20/x
  3. Step 3: Cross multiply
    67,321.40x = 100,986.90 × 20,574.20
  4. Step 4: Simplify right side
    67,321.40x = 2,077,724,677.98
  5. Step 5: Solve for x
    x = 2,077,724,677.98/67,321.40
  6. Step 6: Final answer
    x = 30,862.77

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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.