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Finding the Fourth Proportional to 186.09, 256.64 and 130.81

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Solution

The fourth proportional to 186.09, 256.64 and 130.81 is: 180.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.09 : 256.64 = 130.81 : x
  2. Step 2: Convert to fraction form
    186.09/256.64 = 130.81/x
  3. Step 3: Cross multiply
    186.09x = 256.64 × 130.81
  4. Step 4: Simplify right side
    186.09x = 33,570.76
  5. Step 5: Solve for x
    x = 33,570.76/186.09
  6. Step 6: Final answer
    x = 180.40

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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.