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Finding the Fourth Proportional to 620.66, 930.45 and 312.09

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Solution

The fourth proportional to 620.66, 930.45 and 312.09 is: 467.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.66 : 930.45 = 312.09 : x
  2. Step 2: Convert to fraction form
    620.66/930.45 = 312.09/x
  3. Step 3: Cross multiply
    620.66x = 930.45 × 312.09
  4. Step 4: Simplify right side
    620.66x = 290,381.82
  5. Step 5: Solve for x
    x = 290,381.82/620.66
  6. Step 6: Final answer
    x = 467.86

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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.