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Finding the Fourth Proportional to 211.48, 317.32 and 138.38

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Solution

The fourth proportional to 211.48, 317.32 and 138.38 is: 207.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.48 : 317.32 = 138.38 : x
  2. Step 2: Convert to fraction form
    211.48/317.32 = 138.38/x
  3. Step 3: Cross multiply
    211.48x = 317.32 × 138.38
  4. Step 4: Simplify right side
    211.48x = 43,908.81
  5. Step 5: Solve for x
    x = 43,908.81/211.48
  6. Step 6: Final answer
    x = 207.63

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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.