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Finding the Fourth Proportional to 173.13, 259.21 and 138.70

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Solution

The fourth proportional to 173.13, 259.21 and 138.70 is: 207.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.13 : 259.21 = 138.70 : x
  2. Step 2: Convert to fraction form
    173.13/259.21 = 138.70/x
  3. Step 3: Cross multiply
    173.13x = 259.21 × 138.70
  4. Step 4: Simplify right side
    173.13x = 35,952.43
  5. Step 5: Solve for x
    x = 35,952.43/173.13
  6. Step 6: Final answer
    x = 207.66

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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.