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Finding the Fourth Proportional to 173.12, 259.47 and 91.91

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Solution

The fourth proportional to 173.12, 259.47 and 91.91 is: 137.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.12 : 259.47 = 91.91 : x
  2. Step 2: Convert to fraction form
    173.12/259.47 = 91.91/x
  3. Step 3: Cross multiply
    173.12x = 259.47 × 91.91
  4. Step 4: Simplify right side
    173.12x = 23,848.54
  5. Step 5: Solve for x
    x = 23,848.54/173.12
  6. Step 6: Final answer
    x = 137.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.