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Finding the Fourth Proportional to 131.34, 181.23 and 84.72

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Solution

The fourth proportional to 131.34, 181.23 and 84.72 is: 116.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.34 : 181.23 = 84.72 : x
  2. Step 2: Convert to fraction form
    131.34/181.23 = 84.72/x
  3. Step 3: Cross multiply
    131.34x = 181.23 × 84.72
  4. Step 4: Simplify right side
    131.34x = 15,353.81
  5. Step 5: Solve for x
    x = 15,353.81/131.34
  6. Step 6: Final answer
    x = 116.90

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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.