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Finding the Fourth Proportional to 854.45, 1,179.17 and 618.51

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Solution

The fourth proportional to 854.45, 1,179.17 and 618.51 is: 853.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.45 : 1,179.17 = 618.51 : x
  2. Step 2: Convert to fraction form
    854.45/1,179.17 = 618.51/x
  3. Step 3: Cross multiply
    854.45x = 1,179.17 × 618.51
  4. Step 4: Simplify right side
    854.45x = 729,325.34
  5. Step 5: Solve for x
    x = 729,325.34/854.45
  6. Step 6: Final answer
    x = 853.57

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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.