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Finding the Fourth Proportional to 421.01, 631.38 and 274.67

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Solution

The fourth proportional to 421.01, 631.38 and 274.67 is: 411.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.01 : 631.38 = 274.67 : x
  2. Step 2: Convert to fraction form
    421.01/631.38 = 274.67/x
  3. Step 3: Cross multiply
    421.01x = 631.38 × 274.67
  4. Step 4: Simplify right side
    421.01x = 173,419.84
  5. Step 5: Solve for x
    x = 173,419.84/421.01
  6. Step 6: Final answer
    x = 411.92

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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.