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Finding the Fourth Proportional to 451.23, 621.21 and 393.01

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Solution

The fourth proportional to 451.23, 621.21 and 393.01 is: 541.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.23 : 621.21 = 393.01 : x
  2. Step 2: Convert to fraction form
    451.23/621.21 = 393.01/x
  3. Step 3: Cross multiply
    451.23x = 621.21 × 393.01
  4. Step 4: Simplify right side
    451.23x = 244,141.74
  5. Step 5: Solve for x
    x = 244,141.74/451.23
  6. Step 6: Final answer
    x = 541.06

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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.