Home / 429,738.80-644,608.20-426,628.40

Finding the Fourth Proportional to 429,738.80, 644,608.20 and 426,628.40

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Solution

The fourth proportional to 429,738.80, 644,608.20 and 426,628.40 is: 639,942.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,738.80 : 644,608.20 = 426,628.40 : x
  2. Step 2: Convert to fraction form
    429,738.80/644,608.20 = 426,628.40/x
  3. Step 3: Cross multiply
    429,738.80x = 644,608.20 × 426,628.40
  4. Step 4: Simplify right side
    429,738.80x = 275,008,164,992.88
  5. Step 5: Solve for x
    x = 275,008,164,992.88/429,738.80
  6. Step 6: Final answer
    x = 639,942.60

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1.5x scale

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.