Home / 129,857.20-194,785.80-66,871.60

Finding the Fourth Proportional to 129,857.20, 194,785.80 and 66,871.60

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Solution

The fourth proportional to 129,857.20, 194,785.80 and 66,871.60 is: 100,307.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,857.20 : 194,785.80 = 66,871.60 : x
  2. Step 2: Convert to fraction form
    129,857.20/194,785.80 = 66,871.60/x
  3. Step 3: Cross multiply
    129,857.20x = 194,785.80 × 66,871.60
  4. Step 4: Simplify right side
    129,857.20x = 13,025,638,103.28
  5. Step 5: Solve for x
    x = 13,025,638,103.28/129,857.20
  6. Step 6: Final answer
    x = 100,307.40

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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.