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Finding the Fourth Proportional to 380.36, 570.54 and 136.91

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Solution

The fourth proportional to 380.36, 570.54 and 136.91 is: 205.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.36 : 570.54 = 136.91 : x
  2. Step 2: Convert to fraction form
    380.36/570.54 = 136.91/x
  3. Step 3: Cross multiply
    380.36x = 570.54 × 136.91
  4. Step 4: Simplify right side
    380.36x = 78,109.78
  5. Step 5: Solve for x
    x = 78,109.78/380.36
  6. Step 6: Final answer
    x = 205.36

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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.