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Finding the Fourth Proportional to 430.25, 644.48 and 275.39

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Solution

The fourth proportional to 430.25, 644.48 and 275.39 is: 412.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.25 : 644.48 = 275.39 : x
  2. Step 2: Convert to fraction form
    430.25/644.48 = 275.39/x
  3. Step 3: Cross multiply
    430.25x = 644.48 × 275.39
  4. Step 4: Simplify right side
    430.25x = 177,481.97
  5. Step 5: Solve for x
    x = 177,481.97/430.25
  6. Step 6: Final answer
    x = 412.51

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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.