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Finding the Fourth Proportional to 3,159.78, 4,739.67 and 819.78

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Solution

The fourth proportional to 3,159.78, 4,739.67 and 819.78 is: 1,229.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,159.78 : 4,739.67 = 819.78 : x
  2. Step 2: Convert to fraction form
    3,159.78/4,739.67 = 819.78/x
  3. Step 3: Cross multiply
    3,159.78x = 4,739.67 × 819.78
  4. Step 4: Simplify right side
    3,159.78x = 3,885,486.67
  5. Step 5: Solve for x
    x = 3,885,486.67/3,159.78
  6. Step 6: Final answer
    x = 1,229.67

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1.5x scale

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.