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Finding the Fourth Proportional to 213,720.60, 320,580.90 and 203,879.10

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Solution

The fourth proportional to 213,720.60, 320,580.90 and 203,879.10 is: 305,818.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,720.60 : 320,580.90 = 203,879.10 : x
  2. Step 2: Convert to fraction form
    213,720.60/320,580.90 = 203,879.10/x
  3. Step 3: Cross multiply
    213,720.60x = 320,580.90 × 203,879.10
  4. Step 4: Simplify right side
    213,720.60x = 65,359,745,369.19
  5. Step 5: Solve for x
    x = 65,359,745,369.19/213,720.60
  6. Step 6: Final answer
    x = 305,818.65

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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.