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Finding the Fourth Proportional to 131, 180.80 and 79.24

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Solution

The fourth proportional to 131, 180.80 and 79.24 is: 109.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    131 : 180.80 = 79.24 : x
  2. Step 2: Convert to fraction form
    131/180.80 = 79.24/x
  3. Step 3: Cross multiply
    131x = 180.80 × 79.24
  4. Step 4: Simplify right side
    131x = 14,326.59
  5. Step 5: Solve for x
    x = 14,326.59/131
  6. Step 6: Final answer
    x = 109.36

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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.