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Finding the Fourth Proportional to 76.39, 114.54 and 54.72

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Solution

The fourth proportional to 76.39, 114.54 and 54.72 is: 82.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.39 : 114.54 = 54.72 : x
  2. Step 2: Convert to fraction form
    76.39/114.54 = 54.72/x
  3. Step 3: Cross multiply
    76.39x = 114.54 × 54.72
  4. Step 4: Simplify right side
    76.39x = 6,267.06
  5. Step 5: Solve for x
    x = 6,267.06/76.39
  6. Step 6: Final answer
    x = 82.05

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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.