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Finding the Fourth Proportional to 420.34, 580.25 and 254.52

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Solution

The fourth proportional to 420.34, 580.25 and 254.52 is: 351.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.34 : 580.25 = 254.52 : x
  2. Step 2: Convert to fraction form
    420.34/580.25 = 254.52/x
  3. Step 3: Cross multiply
    420.34x = 580.25 × 254.52
  4. Step 4: Simplify right side
    420.34x = 147,685.23
  5. Step 5: Solve for x
    x = 147,685.23/420.34
  6. Step 6: Final answer
    x = 351.35

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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.