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Finding the Fourth Proportional to 186.26, 257 and 112.64

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Solution

The fourth proportional to 186.26, 257 and 112.64 is: 155.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.26 : 257 = 112.64 : x
  2. Step 2: Convert to fraction form
    186.26/257 = 112.64/x
  3. Step 3: Cross multiply
    186.26x = 257 × 112.64
  4. Step 4: Simplify right side
    186.26x = 28,948.48
  5. Step 5: Solve for x
    x = 28,948.48/186.26
  6. Step 6: Final answer
    x = 155.42

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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.