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Finding the Fourth Proportional to 421.60, 632 and 190.64

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Solution

The fourth proportional to 421.60, 632 and 190.64 is: 285.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.60 : 632 = 190.64 : x
  2. Step 2: Convert to fraction form
    421.60/632 = 190.64/x
  3. Step 3: Cross multiply
    421.60x = 632 × 190.64
  4. Step 4: Simplify right side
    421.60x = 120,484.48
  5. Step 5: Solve for x
    x = 120,484.48/421.60
  6. Step 6: Final answer
    x = 285.78

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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.