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Finding the Fourth Proportional to 257.99, 356.17 and 159.81

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Solution

The fourth proportional to 257.99, 356.17 and 159.81 is: 220.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.99 : 356.17 = 159.81 : x
  2. Step 2: Convert to fraction form
    257.99/356.17 = 159.81/x
  3. Step 3: Cross multiply
    257.99x = 356.17 × 159.81
  4. Step 4: Simplify right side
    257.99x = 56,916.95
  5. Step 5: Solve for x
    x = 56,916.95/257.99
  6. Step 6: Final answer
    x = 220.62

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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.