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Finding the Fourth Proportional to 312.08, 465.12 and 309.54

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Solution

The fourth proportional to 312.08, 465.12 and 309.54 is: 461.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.08 : 465.12 = 309.54 : x
  2. Step 2: Convert to fraction form
    312.08/465.12 = 309.54/x
  3. Step 3: Cross multiply
    312.08x = 465.12 × 309.54
  4. Step 4: Simplify right side
    312.08x = 143,973.24
  5. Step 5: Solve for x
    x = 143,973.24/312.08
  6. Step 6: Final answer
    x = 461.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.