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Finding the Fourth Proportional to 403.06, 556.05 and 315.38

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Solution

The fourth proportional to 403.06, 556.05 and 315.38 is: 435.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.06 : 556.05 = 315.38 : x
  2. Step 2: Convert to fraction form
    403.06/556.05 = 315.38/x
  3. Step 3: Cross multiply
    403.06x = 556.05 × 315.38
  4. Step 4: Simplify right side
    403.06x = 175,367.05
  5. Step 5: Solve for x
    x = 175,367.05/403.06
  6. Step 6: Final answer
    x = 435.09

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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.