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Finding the Fourth Proportional to 172.69, 259.40 and 91.51

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Solution

The fourth proportional to 172.69, 259.40 and 91.51 is: 137.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.69 : 259.40 = 91.51 : x
  2. Step 2: Convert to fraction form
    172.69/259.40 = 91.51/x
  3. Step 3: Cross multiply
    172.69x = 259.40 × 91.51
  4. Step 4: Simplify right side
    172.69x = 23,737.69
  5. Step 5: Solve for x
    x = 23,737.69/172.69
  6. Step 6: Final answer
    x = 137.46

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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.