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Finding the Fourth Proportional to 421.93, 632.20 and 259.27

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Solution

The fourth proportional to 421.93, 632.20 and 259.27 is: 388.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.93 : 632.20 = 259.27 : x
  2. Step 2: Convert to fraction form
    421.93/632.20 = 259.27/x
  3. Step 3: Cross multiply
    421.93x = 632.20 × 259.27
  4. Step 4: Simplify right side
    421.93x = 163,910.49
  5. Step 5: Solve for x
    x = 163,910.49/421.93
  6. Step 6: Final answer
    x = 388.48

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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.