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Finding the Fourth Proportional to 212,470.90, 318,879.15 and 205,558.90

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Solution

The fourth proportional to 212,470.90, 318,879.15 and 205,558.90 is: 308,505.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,470.90 : 318,879.15 = 205,558.90 : x
  2. Step 2: Convert to fraction form
    212,470.90/318,879.15 = 205,558.90/x
  3. Step 3: Cross multiply
    212,470.90x = 318,879.15 × 205,558.90
  4. Step 4: Simplify right side
    212,470.90x = 65,548,447,306.94
  5. Step 5: Solve for x
    x = 65,548,447,306.94/212,470.90
  6. Step 6: Final answer
    x = 308,505.53

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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.