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Finding the Fourth Proportional to 257.51, 355.34 and 157.90

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Solution

The fourth proportional to 257.51, 355.34 and 157.90 is: 217.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.51 : 355.34 = 157.90 : x
  2. Step 2: Convert to fraction form
    257.51/355.34 = 157.90/x
  3. Step 3: Cross multiply
    257.51x = 355.34 × 157.90
  4. Step 4: Simplify right side
    257.51x = 56,108.19
  5. Step 5: Solve for x
    x = 56,108.19/257.51
  6. Step 6: Final answer
    x = 217.89

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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.