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Finding the Fourth Proportional to 131.76, 181.40 and 109.88

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Solution

The fourth proportional to 131.76, 181.40 and 109.88 is: 151.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.76 : 181.40 = 109.88 : x
  2. Step 2: Convert to fraction form
    131.76/181.40 = 109.88/x
  3. Step 3: Cross multiply
    131.76x = 181.40 × 109.88
  4. Step 4: Simplify right side
    131.76x = 19,932.23
  5. Step 5: Solve for x
    x = 19,932.23/131.76
  6. Step 6: Final answer
    x = 151.28

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.