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Finding the Fourth Proportional to 663.06, 993.94 and 389.10

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Solution

The fourth proportional to 663.06, 993.94 and 389.10 is: 583.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.06 : 993.94 = 389.10 : x
  2. Step 2: Convert to fraction form
    663.06/993.94 = 389.10/x
  3. Step 3: Cross multiply
    663.06x = 993.94 × 389.10
  4. Step 4: Simplify right side
    663.06x = 386,742.05
  5. Step 5: Solve for x
    x = 386,742.05/663.06
  6. Step 6: Final answer
    x = 583.27

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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.