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Finding the Fourth Proportional to 172.99, 259.42 and 86.30

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Solution

The fourth proportional to 172.99, 259.42 and 86.30 is: 129.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.99 : 259.42 = 86.30 : x
  2. Step 2: Convert to fraction form
    172.99/259.42 = 86.30/x
  3. Step 3: Cross multiply
    172.99x = 259.42 × 86.30
  4. Step 4: Simplify right side
    172.99x = 22,387.51
  5. Step 5: Solve for x
    x = 22,387.51/172.99
  6. Step 6: Final answer
    x = 129.42

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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.