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Finding the Fourth Proportional to 172.91, 259.38 and 70.18

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Solution

The fourth proportional to 172.91, 259.38 and 70.18 is: 105.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.91 : 259.38 = 70.18 : x
  2. Step 2: Convert to fraction form
    172.91/259.38 = 70.18/x
  3. Step 3: Cross multiply
    172.91x = 259.38 × 70.18
  4. Step 4: Simplify right side
    172.91x = 18,203.29
  5. Step 5: Solve for x
    x = 18,203.29/172.91
  6. Step 6: Final answer
    x = 105.28

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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.