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Finding the Fourth Proportional to 403.22, 556.02 and 309.98

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Solution

The fourth proportional to 403.22, 556.02 and 309.98 is: 427.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.22 : 556.02 = 309.98 : x
  2. Step 2: Convert to fraction form
    403.22/556.02 = 309.98/x
  3. Step 3: Cross multiply
    403.22x = 556.02 × 309.98
  4. Step 4: Simplify right side
    403.22x = 172,355.08
  5. Step 5: Solve for x
    x = 172,355.08/403.22
  6. Step 6: Final answer
    x = 427.45

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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.