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Finding the Fourth Proportional to 66,830.40, 100,216.20 and 20,072.40

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Solution

The fourth proportional to 66,830.40, 100,216.20 and 20,072.40 is: 30,099.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,830.40 : 100,216.20 = 20,072.40 : x
  2. Step 2: Convert to fraction form
    66,830.40/100,216.20 = 20,072.40/x
  3. Step 3: Cross multiply
    66,830.40x = 100,216.20 × 20,072.40
  4. Step 4: Simplify right side
    66,830.40x = 2,011,579,652.88
  5. Step 5: Solve for x
    x = 2,011,579,652.88/66,830.40
  6. Step 6: Final answer
    x = 30,099.77

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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.