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Finding the Fourth Proportional to 641,860.70, 885,795.44 and 355,380.78

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Solution

The fourth proportional to 641,860.70, 885,795.44 and 355,380.78 is: 490,440.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,860.70 : 885,795.44 = 355,380.78 : x
  2. Step 2: Convert to fraction form
    641,860.70/885,795.44 = 355,380.78/x
  3. Step 3: Cross multiply
    641,860.70x = 885,795.44 × 355,380.78
  4. Step 4: Simplify right side
    641,860.70x = 314,794,668,181.76
  5. Step 5: Solve for x
    x = 314,794,668,181.76/641,860.70
  6. Step 6: Final answer
    x = 490,440.79

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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.