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Finding the Fourth Proportional to 421.04, 580.57 and 308.50

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Solution

The fourth proportional to 421.04, 580.57 and 308.50 is: 425.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.04 : 580.57 = 308.50 : x
  2. Step 2: Convert to fraction form
    421.04/580.57 = 308.50/x
  3. Step 3: Cross multiply
    421.04x = 580.57 × 308.50
  4. Step 4: Simplify right side
    421.04x = 179,103.62
  5. Step 5: Solve for x
    x = 179,103.62/421.04
  6. Step 6: Final answer
    x = 425.38

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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.