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Finding the Fourth Proportional to 854.48, 1,178.78 and 618.05

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Solution

The fourth proportional to 854.48, 1,178.78 and 618.05 is: 852.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.48 : 1,178.78 = 618.05 : x
  2. Step 2: Convert to fraction form
    854.48/1,178.78 = 618.05/x
  3. Step 3: Cross multiply
    854.48x = 1,178.78 × 618.05
  4. Step 4: Simplify right side
    854.48x = 728,544.98
  5. Step 5: Solve for x
    x = 728,544.98/854.48
  6. Step 6: Final answer
    x = 852.62

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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.