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Finding the Fourth Proportional to 423.36, 634.11 and 260.55

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Solution

The fourth proportional to 423.36, 634.11 and 260.55 is: 390.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.36 : 634.11 = 260.55 : x
  2. Step 2: Convert to fraction form
    423.36/634.11 = 260.55/x
  3. Step 3: Cross multiply
    423.36x = 634.11 × 260.55
  4. Step 4: Simplify right side
    423.36x = 165,217.36
  5. Step 5: Solve for x
    x = 165,217.36/423.36
  6. Step 6: Final answer
    x = 390.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.