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Finding the Fourth Proportional to 574.18, 860.78 and 208.72

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Solution

The fourth proportional to 574.18, 860.78 and 208.72 is: 312.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.18 : 860.78 = 208.72 : x
  2. Step 2: Convert to fraction form
    574.18/860.78 = 208.72/x
  3. Step 3: Cross multiply
    574.18x = 860.78 × 208.72
  4. Step 4: Simplify right side
    574.18x = 179,662.00
  5. Step 5: Solve for x
    x = 179,662.00/574.18
  6. Step 6: Final answer
    x = 312.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.