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Finding the Fourth Proportional to 186.72, 257.10 and 142.50

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Solution

The fourth proportional to 186.72, 257.10 and 142.50 is: 196.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.72 : 257.10 = 142.50 : x
  2. Step 2: Convert to fraction form
    186.72/257.10 = 142.50/x
  3. Step 3: Cross multiply
    186.72x = 257.10 × 142.50
  4. Step 4: Simplify right side
    186.72x = 36,636.75
  5. Step 5: Solve for x
    x = 36,636.75/186.72
  6. Step 6: Final answer
    x = 196.21

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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.