Home / 428,546.34-642,820.59-129,027.78

Finding the Fourth Proportional to 428,546.34, 642,820.59 and 129,027.78

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Solution

The fourth proportional to 428,546.34, 642,820.59 and 129,027.78 is: 193,542.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,546.34 : 642,820.59 = 129,027.78 : x
  2. Step 2: Convert to fraction form
    428,546.34/642,820.59 = 129,027.78/x
  3. Step 3: Cross multiply
    428,546.34x = 642,820.59 × 129,027.78
  4. Step 4: Simplify right side
    428,546.34x = 82,941,713,665.99
  5. Step 5: Solve for x
    x = 82,941,713,665.99/428,546.34
  6. Step 6: Final answer
    x = 193,542.00

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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.