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Finding the Fourth Proportional to 76.43, 114.55 and 54.64

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Solution

The fourth proportional to 76.43, 114.55 and 54.64 is: 81.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.43 : 114.55 = 54.64 : x
  2. Step 2: Convert to fraction form
    76.43/114.55 = 54.64/x
  3. Step 3: Cross multiply
    76.43x = 114.55 × 54.64
  4. Step 4: Simplify right side
    76.43x = 6,258.74
  5. Step 5: Solve for x
    x = 6,258.74/76.43
  6. Step 6: Final answer
    x = 81.89

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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.