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Finding the Fourth Proportional to 853.55, 1,278.97 and 621.38

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Solution

The fourth proportional to 853.55, 1,278.97 and 621.38 is: 931.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.55 : 1,278.97 = 621.38 : x
  2. Step 2: Convert to fraction form
    853.55/1,278.97 = 621.38/x
  3. Step 3: Cross multiply
    853.55x = 1,278.97 × 621.38
  4. Step 4: Simplify right side
    853.55x = 794,719.98
  5. Step 5: Solve for x
    x = 794,719.98/853.55
  6. Step 6: Final answer
    x = 931.08

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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.