Home / 428,349.69-642,556.40-128,806.29

Finding the Fourth Proportional to 428,349.69, 642,556.40 and 128,806.29

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Solution

The fourth proportional to 428,349.69, 642,556.40 and 128,806.29 is: 193,219.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,349.69 : 642,556.40 = 128,806.29 : x
  2. Step 2: Convert to fraction form
    428,349.69/642,556.40 = 128,806.29/x
  3. Step 3: Cross multiply
    428,349.69x = 642,556.40 × 128,806.29
  4. Step 4: Simplify right side
    428,349.69x = 82,765,305,355.72
  5. Step 5: Solve for x
    x = 82,765,305,355.72/428,349.69
  6. Step 6: Final answer
    x = 193,219.02

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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.