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Finding the Fourth Proportional to 257.34, 386.01 and 128.94

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Solution

The fourth proportional to 257.34, 386.01 and 128.94 is: 193.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.34 : 386.01 = 128.94 : x
  2. Step 2: Convert to fraction form
    257.34/386.01 = 128.94/x
  3. Step 3: Cross multiply
    257.34x = 386.01 × 128.94
  4. Step 4: Simplify right side
    257.34x = 49,772.13
  5. Step 5: Solve for x
    x = 49,772.13/257.34
  6. Step 6: Final answer
    x = 193.41

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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.