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Finding the Fourth Proportional to 494.56, 681.60 and 389.20

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Solution

The fourth proportional to 494.56, 681.60 and 389.20 is: 536.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    494.56 : 681.60 = 389.20 : x
  2. Step 2: Convert to fraction form
    494.56/681.60 = 389.20/x
  3. Step 3: Cross multiply
    494.56x = 681.60 × 389.20
  4. Step 4: Simplify right side
    494.56x = 265,278.72
  5. Step 5: Solve for x
    x = 265,278.72/494.56
  6. Step 6: Final answer
    x = 536.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.