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Finding the Fourth Proportional to 173.59, 239.49 and 99.86

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Solution

The fourth proportional to 173.59, 239.49 and 99.86 is: 137.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.59 : 239.49 = 99.86 : x
  2. Step 2: Convert to fraction form
    173.59/239.49 = 99.86/x
  3. Step 3: Cross multiply
    173.59x = 239.49 × 99.86
  4. Step 4: Simplify right side
    173.59x = 23,914.27
  5. Step 5: Solve for x
    x = 23,914.27/173.59
  6. Step 6: Final answer
    x = 137.76

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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.