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Finding the Fourth Proportional to 129.28, 178.32 and 114.40

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Solution

The fourth proportional to 129.28, 178.32 and 114.40 is: 157.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.28 : 178.32 = 114.40 : x
  2. Step 2: Convert to fraction form
    129.28/178.32 = 114.40/x
  3. Step 3: Cross multiply
    129.28x = 178.32 × 114.40
  4. Step 4: Simplify right side
    129.28x = 20,399.81
  5. Step 5: Solve for x
    x = 20,399.81/129.28
  6. Step 6: Final answer
    x = 157.80

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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.