Home / 428,353.44-642,562.02-128,810.04

Finding the Fourth Proportional to 428,353.44, 642,562.02 and 128,810.04

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Solution

The fourth proportional to 428,353.44, 642,562.02 and 128,810.04 is: 193,224.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,353.44 : 642,562.02 = 128,810.04 : x
  2. Step 2: Convert to fraction form
    428,353.44/642,562.02 = 128,810.04/x
  3. Step 3: Cross multiply
    428,353.44x = 642,562.02 × 128,810.04
  4. Step 4: Simplify right side
    428,353.44x = 82,768,439,498.68
  5. Step 5: Solve for x
    x = 82,768,439,498.68/428,353.44
  6. Step 6: Final answer
    x = 193,224.64

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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.