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Finding the Fourth Proportional to 421.60, 632.20 and 178

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Solution

The fourth proportional to 421.60, 632.20 and 178 is: 266.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.60 : 632.20 = 178 : x
  2. Step 2: Convert to fraction form
    421.60/632.20 = 178/x
  3. Step 3: Cross multiply
    421.60x = 632.20 × 178
  4. Step 4: Simplify right side
    421.60x = 112,531.60
  5. Step 5: Solve for x
    x = 112,531.60/421.60
  6. Step 6: Final answer
    x = 266.92

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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.