Home / 678,401.34-936,631.97-420,553.84

Finding the Fourth Proportional to 678,401.34, 936,631.97 and 420,553.84

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Solution

The fourth proportional to 678,401.34, 936,631.97 and 420,553.84 is: 580,635.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,401.34 : 936,631.97 = 420,553.84 : x
  2. Step 2: Convert to fraction form
    678,401.34/936,631.97 = 420,553.84/x
  3. Step 3: Cross multiply
    678,401.34x = 936,631.97 × 420,553.84
  4. Step 4: Simplify right side
    678,401.34x = 393,904,172,904.79
  5. Step 5: Solve for x
    x = 393,904,172,904.79/678,401.34
  6. Step 6: Final answer
    x = 580,635.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.