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Finding the Fourth Proportional to 570.45, 855 and 327.15

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Solution

The fourth proportional to 570.45, 855 and 327.15 is: 490.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.45 : 855 = 327.15 : x
  2. Step 2: Convert to fraction form
    570.45/855 = 327.15/x
  3. Step 3: Cross multiply
    570.45x = 855 × 327.15
  4. Step 4: Simplify right side
    570.45x = 279,713.25
  5. Step 5: Solve for x
    x = 279,713.25/570.45
  6. Step 6: Final answer
    x = 490.34

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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.