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Finding the Fourth Proportional to 455.09, 681.78 and 393.53

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Solution

The fourth proportional to 455.09, 681.78 and 393.53 is: 589.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.09 : 681.78 = 393.53 : x
  2. Step 2: Convert to fraction form
    455.09/681.78 = 393.53/x
  3. Step 3: Cross multiply
    455.09x = 681.78 × 393.53
  4. Step 4: Simplify right side
    455.09x = 268,300.88
  5. Step 5: Solve for x
    x = 268,300.88/455.09
  6. Step 6: Final answer
    x = 589.56

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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.