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Finding the Fourth Proportional to 257.72, 355.63 and 159.48

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Solution

The fourth proportional to 257.72, 355.63 and 159.48 is: 220.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.72 : 355.63 = 159.48 : x
  2. Step 2: Convert to fraction form
    257.72/355.63 = 159.48/x
  3. Step 3: Cross multiply
    257.72x = 355.63 × 159.48
  4. Step 4: Simplify right side
    257.72x = 56,715.87
  5. Step 5: Solve for x
    x = 56,715.87/257.72
  6. Step 6: Final answer
    x = 220.07

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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.