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Finding the Fourth Proportional to 186.15, 256.58 and 130.79

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Solution

The fourth proportional to 186.15, 256.58 and 130.79 is: 180.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.15 : 256.58 = 130.79 : x
  2. Step 2: Convert to fraction form
    186.15/256.58 = 130.79/x
  3. Step 3: Cross multiply
    186.15x = 256.58 × 130.79
  4. Step 4: Simplify right side
    186.15x = 33,557.44
  5. Step 5: Solve for x
    x = 33,557.44/186.15
  6. Step 6: Final answer
    x = 180.28

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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.