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Finding the Fourth Proportional to 130.21, 179.77 and 81.15

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Solution

The fourth proportional to 130.21, 179.77 and 81.15 is: 112.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.21 : 179.77 = 81.15 : x
  2. Step 2: Convert to fraction form
    130.21/179.77 = 81.15/x
  3. Step 3: Cross multiply
    130.21x = 179.77 × 81.15
  4. Step 4: Simplify right side
    130.21x = 14,588.49
  5. Step 5: Solve for x
    x = 14,588.49/130.21
  6. Step 6: Final answer
    x = 112.04

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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.