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Finding the Fourth Proportional to 187.28, 257.91 and 186.67

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Solution

The fourth proportional to 187.28, 257.91 and 186.67 is: 257.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.28 : 257.91 = 186.67 : x
  2. Step 2: Convert to fraction form
    187.28/257.91 = 186.67/x
  3. Step 3: Cross multiply
    187.28x = 257.91 × 186.67
  4. Step 4: Simplify right side
    187.28x = 48,144.70
  5. Step 5: Solve for x
    x = 48,144.70/187.28
  6. Step 6: Final answer
    x = 257.07

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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.