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Finding the Fourth Proportional to 421.98, 582.28 and 274.88

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Solution

The fourth proportional to 421.98, 582.28 and 274.88 is: 379.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.98 : 582.28 = 274.88 : x
  2. Step 2: Convert to fraction form
    421.98/582.28 = 274.88/x
  3. Step 3: Cross multiply
    421.98x = 582.28 × 274.88
  4. Step 4: Simplify right side
    421.98x = 160,057.13
  5. Step 5: Solve for x
    x = 160,057.13/421.98
  6. Step 6: Final answer
    x = 379.30

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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.