Home / 428,348.44-642,554.52-128,805.04

Finding the Fourth Proportional to 428,348.44, 642,554.52 and 128,805.04

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Solution

The fourth proportional to 428,348.44, 642,554.52 and 128,805.04 is: 193,217.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,348.44 : 642,554.52 = 128,805.04 : x
  2. Step 2: Convert to fraction form
    428,348.44/642,554.52 = 128,805.04/x
  3. Step 3: Cross multiply
    428,348.44x = 642,554.52 × 128,805.04
  4. Step 4: Simplify right side
    428,348.44x = 82,764,260,650.78
  5. Step 5: Solve for x
    x = 82,764,260,650.78/428,348.44
  6. Step 6: Final answer
    x = 193,217.14

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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.