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Finding the Fourth Proportional to 380.82, 570.72 and 289.24

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Solution

The fourth proportional to 380.82, 570.72 and 289.24 is: 433.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.82 : 570.72 = 289.24 : x
  2. Step 2: Convert to fraction form
    380.82/570.72 = 289.24/x
  3. Step 3: Cross multiply
    380.82x = 570.72 × 289.24
  4. Step 4: Simplify right side
    380.82x = 165,075.05
  5. Step 5: Solve for x
    x = 165,075.05/380.82
  6. Step 6: Final answer
    x = 433.47

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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.