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Finding the Fourth Proportional to 380.45, 570.69 and 136.98

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Solution

The fourth proportional to 380.45, 570.69 and 136.98 is: 205.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.45 : 570.69 = 136.98 : x
  2. Step 2: Convert to fraction form
    380.45/570.69 = 136.98/x
  3. Step 3: Cross multiply
    380.45x = 570.69 × 136.98
  4. Step 4: Simplify right side
    380.45x = 78,173.12
  5. Step 5: Solve for x
    x = 78,173.12/380.45
  6. Step 6: Final answer
    x = 205.47

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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.