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Finding the Fourth Proportional to 403.21, 555.78 and 303.48

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Solution

The fourth proportional to 403.21, 555.78 and 303.48 is: 418.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.21 : 555.78 = 303.48 : x
  2. Step 2: Convert to fraction form
    403.21/555.78 = 303.48/x
  3. Step 3: Cross multiply
    403.21x = 555.78 × 303.48
  4. Step 4: Simplify right side
    403.21x = 168,669.25
  5. Step 5: Solve for x
    x = 168,669.25/403.21
  6. Step 6: Final answer
    x = 418.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.