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Finding the Fourth Proportional to 621.86, 930.44 and 389.66

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Solution

The fourth proportional to 621.86, 930.44 and 389.66 is: 583.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.86 : 930.44 = 389.66 : x
  2. Step 2: Convert to fraction form
    621.86/930.44 = 389.66/x
  3. Step 3: Cross multiply
    621.86x = 930.44 × 389.66
  4. Step 4: Simplify right side
    621.86x = 362,555.25
  5. Step 5: Solve for x
    x = 362,555.25/621.86
  6. Step 6: Final answer
    x = 583.02

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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.