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Finding the Fourth Proportional to 451.55, 621.56 and 393.23

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Solution

The fourth proportional to 451.55, 621.56 and 393.23 is: 541.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.55 : 621.56 = 393.23 : x
  2. Step 2: Convert to fraction form
    451.55/621.56 = 393.23/x
  3. Step 3: Cross multiply
    451.55x = 621.56 × 393.23
  4. Step 4: Simplify right side
    451.55x = 244,418.58
  5. Step 5: Solve for x
    x = 244,418.58/451.55
  6. Step 6: Final answer
    x = 541.28

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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.