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Finding the Fourth Proportional to 638,385.75, 880,978.23 and 351,916.07

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Solution

The fourth proportional to 638,385.75, 880,978.23 and 351,916.07 is: 485,647.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,385.75 : 880,978.23 = 351,916.07 : x
  2. Step 2: Convert to fraction form
    638,385.75/880,978.23 = 351,916.07/x
  3. Step 3: Cross multiply
    638,385.75x = 880,978.23 × 351,916.07
  4. Step 4: Simplify right side
    638,385.75x = 310,030,392,052.27
  5. Step 5: Solve for x
    x = 310,030,392,052.27/638,385.75
  6. Step 6: Final answer
    x = 485,647.42

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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.