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Finding the Fourth Proportional to 215,620.40, 323,430.60 and 212,121.20

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Solution

The fourth proportional to 215,620.40, 323,430.60 and 212,121.20 is: 318,181.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,620.40 : 323,430.60 = 212,121.20 : x
  2. Step 2: Convert to fraction form
    215,620.40/323,430.60 = 212,121.20/x
  3. Step 3: Cross multiply
    215,620.40x = 323,430.60 × 212,121.20
  4. Step 4: Simplify right side
    215,620.40x = 68,606,486,988.72
  5. Step 5: Solve for x
    x = 68,606,486,988.72/215,620.40
  6. Step 6: Final answer
    x = 318,181.80

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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.