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Finding the Fourth Proportional to 421,690.92, 581,876.10 and 251,889

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Solution

The fourth proportional to 421,690.92, 581,876.10 and 251,889 is: 347,572.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,690.92 : 581,876.10 = 251,889 : x
  2. Step 2: Convert to fraction form
    421,690.92/581,876.10 = 251,889/x
  3. Step 3: Cross multiply
    421,690.92x = 581,876.10 × 251,889
  4. Step 4: Simplify right side
    421,690.92x = 146,568,188,952.90
  5. Step 5: Solve for x
    x = 146,568,188,952.90/421,690.92
  6. Step 6: Final answer
    x = 347,572.55

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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.