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Finding the Fourth Proportional to 421.69, 632.08 and 275.39

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Solution

The fourth proportional to 421.69, 632.08 and 275.39 is: 412.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.69 : 632.08 = 275.39 : x
  2. Step 2: Convert to fraction form
    421.69/632.08 = 275.39/x
  3. Step 3: Cross multiply
    421.69x = 632.08 × 275.39
  4. Step 4: Simplify right side
    421.69x = 174,065.70
  5. Step 5: Solve for x
    x = 174,065.70/421.69
  6. Step 6: Final answer
    x = 412.78

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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.