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Finding the Fourth Proportional to 3,111.71, 4,668.50 and 920.45

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Solution

The fourth proportional to 3,111.71, 4,668.50 and 920.45 is: 1,380.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.71 : 4,668.50 = 920.45 : x
  2. Step 2: Convert to fraction form
    3,111.71/4,668.50 = 920.45/x
  3. Step 3: Cross multiply
    3,111.71x = 4,668.50 × 920.45
  4. Step 4: Simplify right side
    3,111.71x = 4,297,134.80
  5. Step 5: Solve for x
    x = 4,297,134.80/3,111.71
  6. Step 6: Final answer
    x = 1,380.96

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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.