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Finding the Fourth Proportional to 403.45, 556.88 and 310.03

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Solution

The fourth proportional to 403.45, 556.88 and 310.03 is: 427.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.45 : 556.88 = 310.03 : x
  2. Step 2: Convert to fraction form
    403.45/556.88 = 310.03/x
  3. Step 3: Cross multiply
    403.45x = 556.88 × 310.03
  4. Step 4: Simplify right side
    403.45x = 172,646.56
  5. Step 5: Solve for x
    x = 172,646.56/403.45
  6. Step 6: Final answer
    x = 427.93

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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.