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Finding the Fourth Proportional to 82.83, 114.45 and 78.28

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Solution

The fourth proportional to 82.83, 114.45 and 78.28 is: 108.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.83 : 114.45 = 78.28 : x
  2. Step 2: Convert to fraction form
    82.83/114.45 = 78.28/x
  3. Step 3: Cross multiply
    82.83x = 114.45 × 78.28
  4. Step 4: Simplify right side
    82.83x = 8,958.57
  5. Step 5: Solve for x
    x = 8,958.57/82.83
  6. Step 6: Final answer
    x = 108.15

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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.