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Finding the Fourth Proportional to 847.90, 1,271.69 and 414.78

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Solution

The fourth proportional to 847.90, 1,271.69 and 414.78 is: 622.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.90 : 1,271.69 = 414.78 : x
  2. Step 2: Convert to fraction form
    847.90/1,271.69 = 414.78/x
  3. Step 3: Cross multiply
    847.90x = 1,271.69 × 414.78
  4. Step 4: Simplify right side
    847.90x = 527,471.58
  5. Step 5: Solve for x
    x = 527,471.58/847.90
  6. Step 6: Final answer
    x = 622.09

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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.