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Finding the Fourth Proportional to 421.97, 582.15 and 274.55

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Solution

The fourth proportional to 421.97, 582.15 and 274.55 is: 378.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.97 : 582.15 = 274.55 : x
  2. Step 2: Convert to fraction form
    421.97/582.15 = 274.55/x
  3. Step 3: Cross multiply
    421.97x = 582.15 × 274.55
  4. Step 4: Simplify right side
    421.97x = 159,830.74
  5. Step 5: Solve for x
    x = 159,830.74/421.97
  6. Step 6: Final answer
    x = 378.77

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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.