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Finding the Fourth Proportional to 186.87, 257.55 and 153.75

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Solution

The fourth proportional to 186.87, 257.55 and 153.75 is: 211.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.87 : 257.55 = 153.75 : x
  2. Step 2: Convert to fraction form
    186.87/257.55 = 153.75/x
  3. Step 3: Cross multiply
    186.87x = 257.55 × 153.75
  4. Step 4: Simplify right side
    186.87x = 39,598.31
  5. Step 5: Solve for x
    x = 39,598.31/186.87
  6. Step 6: Final answer
    x = 211.90

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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.