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Finding the Fourth Proportional to 250.15, 375.21 and 76.81

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Solution

The fourth proportional to 250.15, 375.21 and 76.81 is: 115.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.15 : 375.21 = 76.81 : x
  2. Step 2: Convert to fraction form
    250.15/375.21 = 76.81/x
  3. Step 3: Cross multiply
    250.15x = 375.21 × 76.81
  4. Step 4: Simplify right side
    250.15x = 28,818.94
  5. Step 5: Solve for x
    x = 28,818.94/250.15
  6. Step 6: Final answer
    x = 115.21

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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.