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Finding the Fourth Proportional to 77.02, 115.29 and 49.87

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Solution

The fourth proportional to 77.02, 115.29 and 49.87 is: 74.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.02 : 115.29 = 49.87 : x
  2. Step 2: Convert to fraction form
    77.02/115.29 = 49.87/x
  3. Step 3: Cross multiply
    77.02x = 115.29 × 49.87
  4. Step 4: Simplify right side
    77.02x = 5,749.51
  5. Step 5: Solve for x
    x = 5,749.51/77.02
  6. Step 6: Final answer
    x = 74.65

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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.