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Finding the Fourth Proportional to 847.56, 1,271.40 and 299.60

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Solution

The fourth proportional to 847.56, 1,271.40 and 299.60 is: 449.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.56 : 1,271.40 = 299.60 : x
  2. Step 2: Convert to fraction form
    847.56/1,271.40 = 299.60/x
  3. Step 3: Cross multiply
    847.56x = 1,271.40 × 299.60
  4. Step 4: Simplify right side
    847.56x = 380,908.73
  5. Step 5: Solve for x
    x = 380,908.73/847.56
  6. Step 6: Final answer
    x = 449.42

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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.