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Finding the Fourth Proportional to 141.19, 211.85 and 87.05

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Solution

The fourth proportional to 141.19, 211.85 and 87.05 is: 130.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.19 : 211.85 = 87.05 : x
  2. Step 2: Convert to fraction form
    141.19/211.85 = 87.05/x
  3. Step 3: Cross multiply
    141.19x = 211.85 × 87.05
  4. Step 4: Simplify right side
    141.19x = 18,441.54
  5. Step 5: Solve for x
    x = 18,441.54/141.19
  6. Step 6: Final answer
    x = 130.62

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.