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Finding the Fourth Proportional to 102.84, 141.77 and 85.12

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Solution

The fourth proportional to 102.84, 141.77 and 85.12 is: 117.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.84 : 141.77 = 85.12 : x
  2. Step 2: Convert to fraction form
    102.84/141.77 = 85.12/x
  3. Step 3: Cross multiply
    102.84x = 141.77 × 85.12
  4. Step 4: Simplify right side
    102.84x = 12,067.64
  5. Step 5: Solve for x
    x = 12,067.64/102.84
  6. Step 6: Final answer
    x = 117.35

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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.