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Finding the Fourth Proportional to 426,893.98, 640,774.26 and 213,814.57

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Solution

The fourth proportional to 426,893.98, 640,774.26 and 213,814.57 is: 320,938.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,893.98 : 640,774.26 = 213,814.57 : x
  2. Step 2: Convert to fraction form
    426,893.98/640,774.26 = 213,814.57/x
  3. Step 3: Cross multiply
    426,893.98x = 640,774.26 × 213,814.57
  4. Step 4: Simplify right side
    426,893.98x = 137,006,869,665.10
  5. Step 5: Solve for x
    x = 137,006,869,665.10/426,893.98
  6. Step 6: Final answer
    x = 320,938.87

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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.