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Finding the Fourth Proportional to 275.21, 379.74 and 157.16

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Solution

The fourth proportional to 275.21, 379.74 and 157.16 is: 216.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.21 : 379.74 = 157.16 : x
  2. Step 2: Convert to fraction form
    275.21/379.74 = 157.16/x
  3. Step 3: Cross multiply
    275.21x = 379.74 × 157.16
  4. Step 4: Simplify right side
    275.21x = 59,679.94
  5. Step 5: Solve for x
    x = 59,679.94/275.21
  6. Step 6: Final answer
    x = 216.86

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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.