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Finding the Fourth Proportional to 211.28, 317.28 and 157.28

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Solution

The fourth proportional to 211.28, 317.28 and 157.28 is: 236.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.28 : 317.28 = 157.28 : x
  2. Step 2: Convert to fraction form
    211.28/317.28 = 157.28/x
  3. Step 3: Cross multiply
    211.28x = 317.28 × 157.28
  4. Step 4: Simplify right side
    211.28x = 49,901.80
  5. Step 5: Solve for x
    x = 49,901.80/211.28
  6. Step 6: Final answer
    x = 236.19

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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.