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Finding the Fourth Proportional to 382.51, 573.77 and 138.90

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Solution

The fourth proportional to 382.51, 573.77 and 138.90 is: 208.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.51 : 573.77 = 138.90 : x
  2. Step 2: Convert to fraction form
    382.51/573.77 = 138.90/x
  3. Step 3: Cross multiply
    382.51x = 573.77 × 138.90
  4. Step 4: Simplify right side
    382.51x = 79,696.65
  5. Step 5: Solve for x
    x = 79,696.65/382.51
  6. Step 6: Final answer
    x = 208.35

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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.