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Finding the Fourth Proportional to 102.12, 141.12 and 100.50

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Solution

The fourth proportional to 102.12, 141.12 and 100.50 is: 138.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.12 : 141.12 = 100.50 : x
  2. Step 2: Convert to fraction form
    102.12/141.12 = 100.50/x
  3. Step 3: Cross multiply
    102.12x = 141.12 × 100.50
  4. Step 4: Simplify right side
    102.12x = 14,182.56
  5. Step 5: Solve for x
    x = 14,182.56/102.12
  6. Step 6: Final answer
    x = 138.88

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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.