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Finding the Fourth Proportional to 403.66, 554.56 and 388.41

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Solution

The fourth proportional to 403.66, 554.56 and 388.41 is: 533.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.66 : 554.56 = 388.41 : x
  2. Step 2: Convert to fraction form
    403.66/554.56 = 388.41/x
  3. Step 3: Cross multiply
    403.66x = 554.56 × 388.41
  4. Step 4: Simplify right side
    403.66x = 215,396.65
  5. Step 5: Solve for x
    x = 215,396.65/403.66
  6. Step 6: Final answer
    x = 533.61

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.