Home / 428,796.60-643,287.75-129,252.12

Finding the Fourth Proportional to 428,796.60, 643,287.75 and 129,252.12

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Solution

The fourth proportional to 428,796.60, 643,287.75 and 129,252.12 is: 193,906.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,796.60 : 643,287.75 = 129,252.12 : x
  2. Step 2: Convert to fraction form
    428,796.60/643,287.75 = 129,252.12/x
  3. Step 3: Cross multiply
    428,796.60x = 643,287.75 × 129,252.12
  4. Step 4: Simplify right side
    428,796.60x = 83,146,305,457.53
  5. Step 5: Solve for x
    x = 83,146,305,457.53/428,796.60
  6. Step 6: Final answer
    x = 193,906.17

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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.