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Finding the Fourth Proportional to 131.31, 181.30 and 84.80

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Solution

The fourth proportional to 131.31, 181.30 and 84.80 is: 117.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.31 : 181.30 = 84.80 : x
  2. Step 2: Convert to fraction form
    131.31/181.30 = 84.80/x
  3. Step 3: Cross multiply
    131.31x = 181.30 × 84.80
  4. Step 4: Simplify right side
    131.31x = 15,373.12
  5. Step 5: Solve for x
    x = 15,373.12/131.31
  6. Step 6: Final answer
    x = 117.08

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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.