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Finding the Fourth Proportional to 211.34, 317.25 and 153.92

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Solution

The fourth proportional to 211.34, 317.25 and 153.92 is: 231.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.34 : 317.25 = 153.92 : x
  2. Step 2: Convert to fraction form
    211.34/317.25 = 153.92/x
  3. Step 3: Cross multiply
    211.34x = 317.25 × 153.92
  4. Step 4: Simplify right side
    211.34x = 48,831.91
  5. Step 5: Solve for x
    x = 48,831.91/211.34
  6. Step 6: Final answer
    x = 231.06

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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.