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Finding the Fourth Proportional to 186.54, 257.49 and 128.40

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Solution

The fourth proportional to 186.54, 257.49 and 128.40 is: 177.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.54 : 257.49 = 128.40 : x
  2. Step 2: Convert to fraction form
    186.54/257.49 = 128.40/x
  3. Step 3: Cross multiply
    186.54x = 257.49 × 128.40
  4. Step 4: Simplify right side
    186.54x = 33,061.72
  5. Step 5: Solve for x
    x = 33,061.72/186.54
  6. Step 6: Final answer
    x = 177.24

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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.