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Finding the Fourth Proportional to 403.66, 556.89 and 316.60

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Solution

The fourth proportional to 403.66, 556.89 and 316.60 is: 436.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.66 : 556.89 = 316.60 : x
  2. Step 2: Convert to fraction form
    403.66/556.89 = 316.60/x
  3. Step 3: Cross multiply
    403.66x = 556.89 × 316.60
  4. Step 4: Simplify right side
    403.66x = 176,311.37
  5. Step 5: Solve for x
    x = 176,311.37/403.66
  6. Step 6: Final answer
    x = 436.78

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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.