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Finding the Fourth Proportional to 421.82, 632.18 and 190.46

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Solution

The fourth proportional to 421.82, 632.18 and 190.46 is: 285.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.82 : 632.18 = 190.46 : x
  2. Step 2: Convert to fraction form
    421.82/632.18 = 190.46/x
  3. Step 3: Cross multiply
    421.82x = 632.18 × 190.46
  4. Step 4: Simplify right side
    421.82x = 120,407.06
  5. Step 5: Solve for x
    x = 120,407.06/421.82
  6. Step 6: Final answer
    x = 285.45

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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.