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Finding the Fourth Proportional to 420.33, 580.28 and 254.58

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Solution

The fourth proportional to 420.33, 580.28 and 254.58 is: 351.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.33 : 580.28 = 254.58 : x
  2. Step 2: Convert to fraction form
    420.33/580.28 = 254.58/x
  3. Step 3: Cross multiply
    420.33x = 580.28 × 254.58
  4. Step 4: Simplify right side
    420.33x = 147,726.41
  5. Step 5: Solve for x
    x = 147,726.41/420.33
  6. Step 6: Final answer
    x = 351.45

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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.