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Finding the Fourth Proportional to 576.80, 779.40 and 576.80

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Solution

The fourth proportional to 576.80, 779.40 and 576.80 is: 779.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.80 : 779.40 = 576.80 : x
  2. Step 2: Convert to fraction form
    576.80/779.40 = 576.80/x
  3. Step 3: Cross multiply
    576.80x = 779.40 × 576.80
  4. Step 4: Simplify right side
    576.80x = 449,557.92
  5. Step 5: Solve for x
    x = 449,557.92/576.80
  6. Step 6: Final answer
    x = 779.40

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.