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Finding the Fourth Proportional to 403.78, 604.86 and 312.16

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Solution

The fourth proportional to 403.78, 604.86 and 312.16 is: 467.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.78 : 604.86 = 312.16 : x
  2. Step 2: Convert to fraction form
    403.78/604.86 = 312.16/x
  3. Step 3: Cross multiply
    403.78x = 604.86 × 312.16
  4. Step 4: Simplify right side
    403.78x = 188,813.10
  5. Step 5: Solve for x
    x = 188,813.10/403.78
  6. Step 6: Final answer
    x = 467.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.