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Finding the Fourth Proportional to 251.31, 346.81 and 153.05

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Solution

The fourth proportional to 251.31, 346.81 and 153.05 is: 211.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.31 : 346.81 = 153.05 : x
  2. Step 2: Convert to fraction form
    251.31/346.81 = 153.05/x
  3. Step 3: Cross multiply
    251.31x = 346.81 × 153.05
  4. Step 4: Simplify right side
    251.31x = 53,079.27
  5. Step 5: Solve for x
    x = 53,079.27/251.31
  6. Step 6: Final answer
    x = 211.21

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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.