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Finding the Fourth Proportional to 257.02, 354.20 and 186.95

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Solution

The fourth proportional to 257.02, 354.20 and 186.95 is: 257.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.02 : 354.20 = 186.95 : x
  2. Step 2: Convert to fraction form
    257.02/354.20 = 186.95/x
  3. Step 3: Cross multiply
    257.02x = 354.20 × 186.95
  4. Step 4: Simplify right side
    257.02x = 66,217.64
  5. Step 5: Solve for x
    x = 66,217.64/257.02
  6. Step 6: Final answer
    x = 257.64

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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.