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Finding the Fourth Proportional to 173.72, 259.76 and 128.10

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Solution

The fourth proportional to 173.72, 259.76 and 128.10 is: 191.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.72 : 259.76 = 128.10 : x
  2. Step 2: Convert to fraction form
    173.72/259.76 = 128.10/x
  3. Step 3: Cross multiply
    173.72x = 259.76 × 128.10
  4. Step 4: Simplify right side
    173.72x = 33,275.26
  5. Step 5: Solve for x
    x = 33,275.26/173.72
  6. Step 6: Final answer
    x = 191.55

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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.