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Finding the Fourth Proportional to 1,216.80, 1,825.42 and 395

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Solution

The fourth proportional to 1,216.80, 1,825.42 and 395 is: 592.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.80 : 1,825.42 = 395 : x
  2. Step 2: Convert to fraction form
    1,216.80/1,825.42 = 395/x
  3. Step 3: Cross multiply
    1,216.80x = 1,825.42 × 395
  4. Step 4: Simplify right side
    1,216.80x = 721,040.90
  5. Step 5: Solve for x
    x = 721,040.90/1,216.80
  6. Step 6: Final answer
    x = 592.57

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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.