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Finding the Fourth Proportional to 854.44, 1,177.75 and 618.40

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Solution

The fourth proportional to 854.44, 1,177.75 and 618.40 is: 852.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.44 : 1,177.75 = 618.40 : x
  2. Step 2: Convert to fraction form
    854.44/1,177.75 = 618.40/x
  3. Step 3: Cross multiply
    854.44x = 1,177.75 × 618.40
  4. Step 4: Simplify right side
    854.44x = 728,320.60
  5. Step 5: Solve for x
    x = 728,320.60/854.44
  6. Step 6: Final answer
    x = 852.40

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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.