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Finding the Fourth Proportional to 380.77, 571.14 and 137.45

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Solution

The fourth proportional to 380.77, 571.14 and 137.45 is: 206.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.77 : 571.14 = 137.45 : x
  2. Step 2: Convert to fraction form
    380.77/571.14 = 137.45/x
  3. Step 3: Cross multiply
    380.77x = 571.14 × 137.45
  4. Step 4: Simplify right side
    380.77x = 78,503.19
  5. Step 5: Solve for x
    x = 78,503.19/380.77
  6. Step 6: Final answer
    x = 206.17

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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.