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Finding the Fourth Proportional to 102.96, 141.76 and 78.32

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Solution

The fourth proportional to 102.96, 141.76 and 78.32 is: 107.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.96 : 141.76 = 78.32 : x
  2. Step 2: Convert to fraction form
    102.96/141.76 = 78.32/x
  3. Step 3: Cross multiply
    102.96x = 141.76 × 78.32
  4. Step 4: Simplify right side
    102.96x = 11,102.64
  5. Step 5: Solve for x
    x = 11,102.64/102.96
  6. Step 6: Final answer
    x = 107.83

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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.