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Finding the Fourth Proportional to 102.30, 140.96 and 78.98

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Solution

The fourth proportional to 102.30, 140.96 and 78.98 is: 108.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.30 : 140.96 = 78.98 : x
  2. Step 2: Convert to fraction form
    102.30/140.96 = 78.98/x
  3. Step 3: Cross multiply
    102.30x = 140.96 × 78.98
  4. Step 4: Simplify right side
    102.30x = 11,133.02
  5. Step 5: Solve for x
    x = 11,133.02/102.30
  6. Step 6: Final answer
    x = 108.83

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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.