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Finding the Fourth Proportional to 172.91, 259.40 and 51.18

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Solution

The fourth proportional to 172.91, 259.40 and 51.18 is: 76.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.91 : 259.40 = 51.18 : x
  2. Step 2: Convert to fraction form
    172.91/259.40 = 51.18/x
  3. Step 3: Cross multiply
    172.91x = 259.40 × 51.18
  4. Step 4: Simplify right side
    172.91x = 13,274.86
  5. Step 5: Solve for x
    x = 13,274.86/172.91
  6. Step 6: Final answer
    x = 76.78

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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.