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Finding the Fourth Proportional to 1,384.44, 2,074.04 and 920.80

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Solution

The fourth proportional to 1,384.44, 2,074.04 and 920.80 is: 1,379.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,384.44 : 2,074.04 = 920.80 : x
  2. Step 2: Convert to fraction form
    1,384.44/2,074.04 = 920.80/x
  3. Step 3: Cross multiply
    1,384.44x = 2,074.04 × 920.80
  4. Step 4: Simplify right side
    1,384.44x = 1,909,776.03
  5. Step 5: Solve for x
    x = 1,909,776.03/1,384.44
  6. Step 6: Final answer
    x = 1,379.46

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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.