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Finding the Fourth Proportional to 421.58, 581.70 and 274.22

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Solution

The fourth proportional to 421.58, 581.70 and 274.22 is: 378.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.58 : 581.70 = 274.22 : x
  2. Step 2: Convert to fraction form
    421.58/581.70 = 274.22/x
  3. Step 3: Cross multiply
    421.58x = 581.70 × 274.22
  4. Step 4: Simplify right side
    421.58x = 159,513.77
  5. Step 5: Solve for x
    x = 159,513.77/421.58
  6. Step 6: Final answer
    x = 378.37

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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.