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Finding the Fourth Proportional to 425.23, 636.62 and 391.21

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Solution

The fourth proportional to 425.23, 636.62 and 391.21 is: 585.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.23 : 636.62 = 391.21 : x
  2. Step 2: Convert to fraction form
    425.23/636.62 = 391.21/x
  3. Step 3: Cross multiply
    425.23x = 636.62 × 391.21
  4. Step 4: Simplify right side
    425.23x = 249,048.56
  5. Step 5: Solve for x
    x = 249,048.56/425.23
  6. Step 6: Final answer
    x = 585.68

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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.