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Finding the Fourth Proportional to 275.15, 379.71 and 157.14

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Solution

The fourth proportional to 275.15, 379.71 and 157.14 is: 216.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.15 : 379.71 = 157.14 : x
  2. Step 2: Convert to fraction form
    275.15/379.71 = 157.14/x
  3. Step 3: Cross multiply
    275.15x = 379.71 × 157.14
  4. Step 4: Simplify right side
    275.15x = 59,668.02
  5. Step 5: Solve for x
    x = 59,668.02/275.15
  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.