Home / 428,163.90-642,279.06-128,621.04

Finding the Fourth Proportional to 428,163.90, 642,279.06 and 128,621.04

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Solution

The fourth proportional to 428,163.90, 642,279.06 and 128,621.04 is: 192,941.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,163.90 : 642,279.06 = 128,621.04 : x
  2. Step 2: Convert to fraction form
    428,163.90/642,279.06 = 128,621.04/x
  3. Step 3: Cross multiply
    428,163.90x = 642,279.06 × 128,621.04
  4. Step 4: Simplify right side
    428,163.90x = 82,610,600,667.42
  5. Step 5: Solve for x
    x = 82,610,600,667.42/428,163.90
  6. Step 6: Final answer
    x = 192,941.54

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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.