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Finding the Fourth Proportional to 257.16, 354.20 and 207.88

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Solution

The fourth proportional to 257.16, 354.20 and 207.88 is: 286.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.16 : 354.20 = 207.88 : x
  2. Step 2: Convert to fraction form
    257.16/354.20 = 207.88/x
  3. Step 3: Cross multiply
    257.16x = 354.20 × 207.88
  4. Step 4: Simplify right side
    257.16x = 73,631.10
  5. Step 5: Solve for x
    x = 73,631.10/257.16
  6. Step 6: Final answer
    x = 286.32

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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.