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Finding the Fourth Proportional to 421.95, 632.94 and 190.80

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Solution

The fourth proportional to 421.95, 632.94 and 190.80 is: 286.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.95 : 632.94 = 190.80 : x
  2. Step 2: Convert to fraction form
    421.95/632.94 = 190.80/x
  3. Step 3: Cross multiply
    421.95x = 632.94 × 190.80
  4. Step 4: Simplify right side
    421.95x = 120,764.95
  5. Step 5: Solve for x
    x = 120,764.95/421.95
  6. Step 6: Final answer
    x = 286.21

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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.