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Finding the Fourth Proportional to 257.68, 355.49 and 154.18

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Solution

The fourth proportional to 257.68, 355.49 and 154.18 is: 212.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.68 : 355.49 = 154.18 : x
  2. Step 2: Convert to fraction form
    257.68/355.49 = 154.18/x
  3. Step 3: Cross multiply
    257.68x = 355.49 × 154.18
  4. Step 4: Simplify right side
    257.68x = 54,809.45
  5. Step 5: Solve for x
    x = 54,809.45/257.68
  6. Step 6: Final answer
    x = 212.70

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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.