Home / 428,254.49-642,382.21-128,735.04

Finding the Fourth Proportional to 428,254.49, 642,382.21 and 128,735.04

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Solution

The fourth proportional to 428,254.49, 642,382.21 and 128,735.04 is: 193,102.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,254.49 : 642,382.21 = 128,735.04 : x
  2. Step 2: Convert to fraction form
    428,254.49/642,382.21 = 128,735.04/x
  3. Step 3: Cross multiply
    428,254.49x = 642,382.21 × 128,735.04
  4. Step 4: Simplify right side
    428,254.49x = 82,697,099,177.80
  5. Step 5: Solve for x
    x = 82,697,099,177.80/428,254.49
  6. Step 6: Final answer
    x = 193,102.70

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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.