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Finding the Fourth Proportional to 257.88, 387.01 and 189.58

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Solution

The fourth proportional to 257.88, 387.01 and 189.58 is: 284.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.88 : 387.01 = 189.58 : x
  2. Step 2: Convert to fraction form
    257.88/387.01 = 189.58/x
  3. Step 3: Cross multiply
    257.88x = 387.01 × 189.58
  4. Step 4: Simplify right side
    257.88x = 73,369.36
  5. Step 5: Solve for x
    x = 73,369.36/257.88
  6. Step 6: Final answer
    x = 284.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.