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Finding the Fourth Proportional to 853.88, 1,278.99 and 805.95

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Solution

The fourth proportional to 853.88, 1,278.99 and 805.95 is: 1,207.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.88 : 1,278.99 = 805.95 : x
  2. Step 2: Convert to fraction form
    853.88/1,278.99 = 805.95/x
  3. Step 3: Cross multiply
    853.88x = 1,278.99 × 805.95
  4. Step 4: Simplify right side
    853.88x = 1,030,801.99
  5. Step 5: Solve for x
    x = 1,030,801.99/853.88
  6. Step 6: Final answer
    x = 1,207.20

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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.