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Finding the Fourth Proportional to 1,081.80, 1,623.12 and 388.44

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Solution

The fourth proportional to 1,081.80, 1,623.12 and 388.44 is: 582.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.80 : 1,623.12 = 388.44 : x
  2. Step 2: Convert to fraction form
    1,081.80/1,623.12 = 388.44/x
  3. Step 3: Cross multiply
    1,081.80x = 1,623.12 × 388.44
  4. Step 4: Simplify right side
    1,081.80x = 630,484.73
  5. Step 5: Solve for x
    x = 630,484.73/1,081.80
  6. Step 6: Final answer
    x = 582.81

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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.