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Finding the Fourth Proportional to 186.95, 257.91 and 128.63

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Solution

The fourth proportional to 186.95, 257.91 and 128.63 is: 177.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.95 : 257.91 = 128.63 : x
  2. Step 2: Convert to fraction form
    186.95/257.91 = 128.63/x
  3. Step 3: Cross multiply
    186.95x = 257.91 × 128.63
  4. Step 4: Simplify right side
    186.95x = 33,174.96
  5. Step 5: Solve for x
    x = 33,174.96/186.95
  6. Step 6: Final answer
    x = 177.45

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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.