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Finding the Fourth Proportional to 3,679.14, 5,518.52 and 905.64

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Solution

The fourth proportional to 3,679.14, 5,518.52 and 905.64 is: 1,358.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,679.14 : 5,518.52 = 905.64 : x
  2. Step 2: Convert to fraction form
    3,679.14/5,518.52 = 905.64/x
  3. Step 3: Cross multiply
    3,679.14x = 5,518.52 × 905.64
  4. Step 4: Simplify right side
    3,679.14x = 4,997,792.45
  5. Step 5: Solve for x
    x = 4,997,792.45/3,679.14
  6. Step 6: Final answer
    x = 1,358.41

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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.