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Finding the Fourth Proportional to 186.51, 257.40 and 107.86

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Solution

The fourth proportional to 186.51, 257.40 and 107.86 is: 148.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.51 : 257.40 = 107.86 : x
  2. Step 2: Convert to fraction form
    186.51/257.40 = 107.86/x
  3. Step 3: Cross multiply
    186.51x = 257.40 × 107.86
  4. Step 4: Simplify right side
    186.51x = 27,762.58
  5. Step 5: Solve for x
    x = 27,762.58/186.51
  6. Step 6: Final answer
    x = 148.85

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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.