Home / 428,254.58-642,382.35-128,735.13

Finding the Fourth Proportional to 428,254.58, 642,382.35 and 128,735.13

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Solution

The fourth proportional to 428,254.58, 642,382.35 and 128,735.13 is: 193,102.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,254.58 : 642,382.35 = 128,735.13 : x
  2. Step 2: Convert to fraction form
    428,254.58/642,382.35 = 128,735.13/x
  3. Step 3: Cross multiply
    428,254.58x = 642,382.35 × 128,735.13
  4. Step 4: Simplify right side
    428,254.58x = 82,697,173,649.73
  5. Step 5: Solve for x
    x = 82,697,173,649.73/428,254.58
  6. Step 6: Final answer
    x = 193,102.83

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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.