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Finding the Fourth Proportional to 321,919.20, 483,267.60 and 319,586.40

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Solution

The fourth proportional to 321,919.20, 483,267.60 and 319,586.40 is: 479,765.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,919.20 : 483,267.60 = 319,586.40 : x
  2. Step 2: Convert to fraction form
    321,919.20/483,267.60 = 319,586.40/x
  3. Step 3: Cross multiply
    321,919.20x = 483,267.60 × 319,586.40
  4. Step 4: Simplify right side
    321,919.20x = 154,445,752,520.64
  5. Step 5: Solve for x
    x = 154,445,752,520.64/321,919.20
  6. Step 6: Final answer
    x = 479,765.58

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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.