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Finding the Fourth Proportional to 853.31, 1,278.90 and 365.80

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Solution

The fourth proportional to 853.31, 1,278.90 and 365.80 is: 548.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.31 : 1,278.90 = 365.80 : x
  2. Step 2: Convert to fraction form
    853.31/1,278.90 = 365.80/x
  3. Step 3: Cross multiply
    853.31x = 1,278.90 × 365.80
  4. Step 4: Simplify right side
    853.31x = 467,815.23
  5. Step 5: Solve for x
    x = 467,815.23/853.31
  6. Step 6: Final answer
    x = 548.24

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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.