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Finding the Fourth Proportional to 206,880.64, 310,321.20 and 66,660.16

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Solution

The fourth proportional to 206,880.64, 310,321.20 and 66,660.16 is: 99,990.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,880.64 : 310,321.20 = 66,660.16 : x
  2. Step 2: Convert to fraction form
    206,880.64/310,321.20 = 66,660.16/x
  3. Step 3: Cross multiply
    206,880.64x = 310,321.20 × 66,660.16
  4. Step 4: Simplify right side
    206,880.64x = 20,686,060,843.39
  5. Step 5: Solve for x
    x = 20,686,060,843.39/206,880.64
  6. Step 6: Final answer
    x = 99,990.32

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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.