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Finding the Fourth Proportional to 186.92, 280 and 156.40

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Solution

The fourth proportional to 186.92, 280 and 156.40 is: 234.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.92 : 280 = 156.40 : x
  2. Step 2: Convert to fraction form
    186.92/280 = 156.40/x
  3. Step 3: Cross multiply
    186.92x = 280 × 156.40
  4. Step 4: Simplify right side
    186.92x = 43,792
  5. Step 5: Solve for x
    x = 43,792/186.92
  6. Step 6: Final answer
    x = 234.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.