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Finding the Fourth Proportional to 425.81, 587.21 and 393.99

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Solution

The fourth proportional to 425.81, 587.21 and 393.99 is: 543.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.81 : 587.21 = 393.99 : x
  2. Step 2: Convert to fraction form
    425.81/587.21 = 393.99/x
  3. Step 3: Cross multiply
    425.81x = 587.21 × 393.99
  4. Step 4: Simplify right side
    425.81x = 231,352.90
  5. Step 5: Solve for x
    x = 231,352.90/425.81
  6. Step 6: Final answer
    x = 543.33

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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.