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Finding the Fourth Proportional to 131.33, 181.21 and 75.31

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Solution

The fourth proportional to 131.33, 181.21 and 75.31 is: 103.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.33 : 181.21 = 75.31 : x
  2. Step 2: Convert to fraction form
    131.33/181.21 = 75.31/x
  3. Step 3: Cross multiply
    131.33x = 181.21 × 75.31
  4. Step 4: Simplify right side
    131.33x = 13,646.93
  5. Step 5: Solve for x
    x = 13,646.93/131.33
  6. Step 6: Final answer
    x = 103.91

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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.