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Finding the Fourth Proportional to 421.74, 632.40 and 178.20

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Solution

The fourth proportional to 421.74, 632.40 and 178.20 is: 267.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.74 : 632.40 = 178.20 : x
  2. Step 2: Convert to fraction form
    421.74/632.40 = 178.20/x
  3. Step 3: Cross multiply
    421.74x = 632.40 × 178.20
  4. Step 4: Simplify right side
    421.74x = 112,693.68
  5. Step 5: Solve for x
    x = 112,693.68/421.74
  6. Step 6: Final answer
    x = 267.21

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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.