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Finding the Fourth Proportional to 620.15, 929.82 and 311.54

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Solution

The fourth proportional to 620.15, 929.82 and 311.54 is: 467.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.15 : 929.82 = 311.54 : x
  2. Step 2: Convert to fraction form
    620.15/929.82 = 311.54/x
  3. Step 3: Cross multiply
    620.15x = 929.82 × 311.54
  4. Step 4: Simplify right side
    620.15x = 289,676.12
  5. Step 5: Solve for x
    x = 289,676.12/620.15
  6. Step 6: Final answer
    x = 467.11

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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.