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Finding the Fourth Proportional to 102.34, 141.27 and 78.51

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Solution

The fourth proportional to 102.34, 141.27 and 78.51 is: 108.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.34 : 141.27 = 78.51 : x
  2. Step 2: Convert to fraction form
    102.34/141.27 = 78.51/x
  3. Step 3: Cross multiply
    102.34x = 141.27 × 78.51
  4. Step 4: Simplify right side
    102.34x = 11,091.11
  5. Step 5: Solve for x
    x = 11,091.11/102.34
  6. Step 6: Final answer
    x = 108.38

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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.