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Finding the Fourth Proportional to 641,861.72, 885,796.85 and 355,381.80

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Solution

The fourth proportional to 641,861.72, 885,796.85 and 355,381.80 is: 490,442.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,861.72 : 885,796.85 = 355,381.80 : x
  2. Step 2: Convert to fraction form
    641,861.72/885,796.85 = 355,381.80/x
  3. Step 3: Cross multiply
    641,861.72x = 885,796.85 × 355,381.80
  4. Step 4: Simplify right side
    641,861.72x = 314,796,083,528.20
  5. Step 5: Solve for x
    x = 314,796,083,528.20/641,861.72
  6. Step 6: Final answer
    x = 490,442.22

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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.