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Finding the Fourth Proportional to 426,405.84, 639,550.40 and 126,932.64

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Solution

The fourth proportional to 426,405.84, 639,550.40 and 126,932.64 is: 190,381.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,405.84 : 639,550.40 = 126,932.64 : x
  2. Step 2: Convert to fraction form
    426,405.84/639,550.40 = 126,932.64/x
  3. Step 3: Cross multiply
    426,405.84x = 639,550.40 × 126,932.64
  4. Step 4: Simplify right side
    426,405.84x = 81,179,820,685.06
  5. Step 5: Solve for x
    x = 81,179,820,685.06/426,405.84
  6. Step 6: Final answer
    x = 190,381.59

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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.