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Finding the Fourth Proportional to 66,940.16, 100,384.64 and 20,179.20

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Solution

The fourth proportional to 66,940.16, 100,384.64 and 20,179.20 is: 30,261.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,940.16 : 100,384.64 = 20,179.20 : x
  2. Step 2: Convert to fraction form
    66,940.16/100,384.64 = 20,179.20/x
  3. Step 3: Cross multiply
    66,940.16x = 100,384.64 × 20,179.20
  4. Step 4: Simplify right side
    66,940.16x = 2,025,681,727.49
  5. Step 5: Solve for x
    x = 2,025,681,727.49/66,940.16
  6. Step 6: Final answer
    x = 30,261.08

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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.