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Finding the Fourth Proportional to 77.15, 105.87 and 70.19

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Solution

The fourth proportional to 77.15, 105.87 and 70.19 is: 96.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.15 : 105.87 = 70.19 : x
  2. Step 2: Convert to fraction form
    77.15/105.87 = 70.19/x
  3. Step 3: Cross multiply
    77.15x = 105.87 × 70.19
  4. Step 4: Simplify right side
    77.15x = 7,431.28
  5. Step 5: Solve for x
    x = 7,431.28/77.15
  6. Step 6: Final answer
    x = 96.32

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.