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Finding the Fourth Proportional to 421.72, 581.68 and 274.56

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Solution

The fourth proportional to 421.72, 581.68 and 274.56 is: 378.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.72 : 581.68 = 274.56 : x
  2. Step 2: Convert to fraction form
    421.72/581.68 = 274.56/x
  3. Step 3: Cross multiply
    421.72x = 581.68 × 274.56
  4. Step 4: Simplify right side
    421.72x = 159,706.06
  5. Step 5: Solve for x
    x = 159,706.06/421.72
  6. Step 6: Final answer
    x = 378.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.