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Finding the Fourth Proportional to 102.15, 141.03 and 71.05

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Solution

The fourth proportional to 102.15, 141.03 and 71.05 is: 98.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.15 : 141.03 = 71.05 : x
  2. Step 2: Convert to fraction form
    102.15/141.03 = 71.05/x
  3. Step 3: Cross multiply
    102.15x = 141.03 × 71.05
  4. Step 4: Simplify right side
    102.15x = 10,020.18
  5. Step 5: Solve for x
    x = 10,020.18/102.15
  6. Step 6: Final answer
    x = 98.09

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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.