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Finding the Fourth Proportional to 105.05, 158.29 and 87.18

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Solution

The fourth proportional to 105.05, 158.29 and 87.18 is: 131.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.05 : 158.29 = 87.18 : x
  2. Step 2: Convert to fraction form
    105.05/158.29 = 87.18/x
  3. Step 3: Cross multiply
    105.05x = 158.29 × 87.18
  4. Step 4: Simplify right side
    105.05x = 13,799.72
  5. Step 5: Solve for x
    x = 13,799.72/105.05
  6. Step 6: Final answer
    x = 131.36

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These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.