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Finding the Fourth Proportional to 173.58, 239.55 and 99.91

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Solution

The fourth proportional to 173.58, 239.55 and 99.91 is: 137.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.58 : 239.55 = 99.91 : x
  2. Step 2: Convert to fraction form
    173.58/239.55 = 99.91/x
  3. Step 3: Cross multiply
    173.58x = 239.55 × 99.91
  4. Step 4: Simplify right side
    173.58x = 23,933.44
  5. Step 5: Solve for x
    x = 23,933.44/173.58
  6. Step 6: Final answer
    x = 137.88

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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.