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Finding the Fourth Proportional to 130.99, 180.73 and 81.85

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Solution

The fourth proportional to 130.99, 180.73 and 81.85 is: 112.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.99 : 180.73 = 81.85 : x
  2. Step 2: Convert to fraction form
    130.99/180.73 = 81.85/x
  3. Step 3: Cross multiply
    130.99x = 180.73 × 81.85
  4. Step 4: Simplify right side
    130.99x = 14,792.75
  5. Step 5: Solve for x
    x = 14,792.75/130.99
  6. Step 6: Final answer
    x = 112.93

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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.