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Finding the Fourth Proportional to 257.84, 356.16 and 170.72

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Solution

The fourth proportional to 257.84, 356.16 and 170.72 is: 235.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.84 : 356.16 = 170.72 : x
  2. Step 2: Convert to fraction form
    257.84/356.16 = 170.72/x
  3. Step 3: Cross multiply
    257.84x = 356.16 × 170.72
  4. Step 4: Simplify right side
    257.84x = 60,803.64
  5. Step 5: Solve for x
    x = 60,803.64/257.84
  6. Step 6: Final answer
    x = 235.82

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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.