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Finding the Fourth Proportional to 641,861.70, 885,796.82 and 355,381.78

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Solution

The fourth proportional to 641,861.70, 885,796.82 and 355,381.78 is: 490,442.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,861.70 : 885,796.82 = 355,381.78 : x
  2. Step 2: Convert to fraction form
    641,861.70/885,796.82 = 355,381.78/x
  3. Step 3: Cross multiply
    641,861.70x = 885,796.82 × 355,381.78
  4. Step 4: Simplify right side
    641,861.70x = 314,796,050,609.94
  5. Step 5: Solve for x
    x = 314,796,050,609.94/641,861.70
  6. Step 6: Final answer
    x = 490,442.18

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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.