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Finding the Fourth Proportional to 186.20, 256.72 and 176.40

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Solution

The fourth proportional to 186.20, 256.72 and 176.40 is: 243.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    186.20 : 256.72 = 176.40 : x
  2. Step 2: Convert to fraction form
    186.20/256.72 = 176.40/x
  3. Step 3: Cross multiply
    186.20x = 256.72 × 176.40
  4. Step 4: Simplify right side
    186.20x = 45,285.41
  5. Step 5: Solve for x
    x = 45,285.41/186.20
  6. Step 6: Final answer
    x = 243.21

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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.