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Finding the Fourth Proportional to 356.08, 490.56 and 257.20

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Solution

The fourth proportional to 356.08, 490.56 and 257.20 is: 354.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.08 : 490.56 = 257.20 : x
  2. Step 2: Convert to fraction form
    356.08/490.56 = 257.20/x
  3. Step 3: Cross multiply
    356.08x = 490.56 × 257.20
  4. Step 4: Simplify right side
    356.08x = 126,172.03
  5. Step 5: Solve for x
    x = 126,172.03/356.08
  6. Step 6: Final answer
    x = 354.34

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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.