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Finding the Fourth Proportional to 853.58, 1,178.11 and 554.81

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Solution

The fourth proportional to 853.58, 1,178.11 and 554.81 is: 765.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.58 : 1,178.11 = 554.81 : x
  2. Step 2: Convert to fraction form
    853.58/1,178.11 = 554.81/x
  3. Step 3: Cross multiply
    853.58x = 1,178.11 × 554.81
  4. Step 4: Simplify right side
    853.58x = 653,627.21
  5. Step 5: Solve for x
    x = 653,627.21/853.58
  6. Step 6: Final answer
    x = 765.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.