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Finding the Fourth Proportional to 77.15, 115.83 and 53.26

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Solution

The fourth proportional to 77.15, 115.83 and 53.26 is: 79.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.15 : 115.83 = 53.26 : x
  2. Step 2: Convert to fraction form
    77.15/115.83 = 53.26/x
  3. Step 3: Cross multiply
    77.15x = 115.83 × 53.26
  4. Step 4: Simplify right side
    77.15x = 6,168.82
  5. Step 5: Solve for x
    x = 6,168.82/77.15
  6. Step 6: Final answer
    x = 79.96

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Why These Related Problems?

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