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Finding the Fourth Proportional to 452.26, 623.78 and 393.12

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Solution

The fourth proportional to 452.26, 623.78 and 393.12 is: 542.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.26 : 623.78 = 393.12 : x
  2. Step 2: Convert to fraction form
    452.26/623.78 = 393.12/x
  3. Step 3: Cross multiply
    452.26x = 623.78 × 393.12
  4. Step 4: Simplify right side
    452.26x = 245,220.39
  5. Step 5: Solve for x
    x = 245,220.39/452.26
  6. Step 6: Final answer
    x = 542.21

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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.