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Finding the Fourth Proportional to 276.74, 381.86 and 157.10

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Solution

The fourth proportional to 276.74, 381.86 and 157.10 is: 216.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.74 : 381.86 = 157.10 : x
  2. Step 2: Convert to fraction form
    276.74/381.86 = 157.10/x
  3. Step 3: Cross multiply
    276.74x = 381.86 × 157.10
  4. Step 4: Simplify right side
    276.74x = 59,990.21
  5. Step 5: Solve for x
    x = 59,990.21/276.74
  6. Step 6: Final answer
    x = 216.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.