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Finding the Fourth Proportional to 388,934, 583,401 and 126,278

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Solution

The fourth proportional to 388,934, 583,401 and 126,278 is: 189,417

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,934 : 583,401 = 126,278 : x
  2. Step 2: Convert to fraction form
    388,934/583,401 = 126,278/x
  3. Step 3: Cross multiply
    388,934x = 583,401 × 126,278
  4. Step 4: Simplify right side
    388,934x = 73,670,711,478
  5. Step 5: Solve for x
    x = 73,670,711,478/388,934
  6. Step 6: Final answer
    x = 189,417

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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.