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Finding the Fourth Proportional to 620.37, 930.87 and 389.34

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Solution

The fourth proportional to 620.37, 930.87 and 389.34 is: 584.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.37 : 930.87 = 389.34 : x
  2. Step 2: Convert to fraction form
    620.37/930.87 = 389.34/x
  3. Step 3: Cross multiply
    620.37x = 930.87 × 389.34
  4. Step 4: Simplify right side
    620.37x = 362,424.93
  5. Step 5: Solve for x
    x = 362,424.93/620.37
  6. Step 6: Final answer
    x = 584.21

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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.