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Finding the Fourth Proportional to 618.80, 852.93 and 439.40

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Solution

The fourth proportional to 618.80, 852.93 and 439.40 is: 605.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.80 : 852.93 = 439.40 : x
  2. Step 2: Convert to fraction form
    618.80/852.93 = 439.40/x
  3. Step 3: Cross multiply
    618.80x = 852.93 × 439.40
  4. Step 4: Simplify right side
    618.80x = 374,779.57
  5. Step 5: Solve for x
    x = 374,779.57/618.80
  6. Step 6: Final answer
    x = 605.66

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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.