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Finding the Fourth Proportional to 1,083.80, 1,626.12 and 390.44

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Solution

The fourth proportional to 1,083.80, 1,626.12 and 390.44 is: 585.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,083.80 : 1,626.12 = 390.44 : x
  2. Step 2: Convert to fraction form
    1,083.80/1,626.12 = 390.44/x
  3. Step 3: Cross multiply
    1,083.80x = 1,626.12 × 390.44
  4. Step 4: Simplify right side
    1,083.80x = 634,902.29
  5. Step 5: Solve for x
    x = 634,902.29/1,083.80
  6. Step 6: Final answer
    x = 585.81

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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.