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Finding the Fourth Proportional to 257.12, 354.72 and 153.44

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Solution

The fourth proportional to 257.12, 354.72 and 153.44 is: 211.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.12 : 354.72 = 153.44 : x
  2. Step 2: Convert to fraction form
    257.12/354.72 = 153.44/x
  3. Step 3: Cross multiply
    257.12x = 354.72 × 153.44
  4. Step 4: Simplify right side
    257.12x = 54,428.24
  5. Step 5: Solve for x
    x = 54,428.24/257.12
  6. Step 6: Final answer
    x = 211.68

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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.