Home / 428,168.90-642,286.56-128,626.04

Finding the Fourth Proportional to 428,168.90, 642,286.56 and 128,626.04

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Solution

The fourth proportional to 428,168.90, 642,286.56 and 128,626.04 is: 192,949.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,168.90 : 642,286.56 = 128,626.04 : x
  2. Step 2: Convert to fraction form
    428,168.90/642,286.56 = 128,626.04/x
  3. Step 3: Cross multiply
    428,168.90x = 642,286.56 × 128,626.04
  4. Step 4: Simplify right side
    428,168.90x = 82,614,776,758.02
  5. Step 5: Solve for x
    x = 82,614,776,758.02/428,168.90
  6. Step 6: Final answer
    x = 192,949.04

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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.