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Finding the Fourth Proportional to 131.00, 180.60 and 108.79

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Solution

The fourth proportional to 131.00, 180.60 and 108.79 is: 149.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.00 : 180.60 = 108.79 : x
  2. Step 2: Convert to fraction form
    131.00/180.60 = 108.79/x
  3. Step 3: Cross multiply
    131.00x = 180.60 × 108.79
  4. Step 4: Simplify right side
    131.00x = 19,647.61
  5. Step 5: Solve for x
    x = 19,647.61/131.00
  6. Step 6: Final answer
    x = 149.98

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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.