Home / 428,845.84-643,060.77-129,270.58

Finding the Fourth Proportional to 428,845.84, 643,060.77 and 129,270.58

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Solution

The fourth proportional to 428,845.84, 643,060.77 and 129,270.58 is: 193,843.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,845.84 : 643,060.77 = 129,270.58 : x
  2. Step 2: Convert to fraction form
    428,845.84/643,060.77 = 129,270.58/x
  3. Step 3: Cross multiply
    428,845.84x = 643,060.77 × 129,270.58
  4. Step 4: Simplify right side
    428,845.84x = 83,128,838,713.15
  5. Step 5: Solve for x
    x = 83,128,838,713.15/428,845.84
  6. Step 6: Final answer
    x = 193,843.17

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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.