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Finding the Fourth Proportional to 172.20, 258.18 and 56.60

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Solution

The fourth proportional to 172.20, 258.18 and 56.60 is: 84.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.20 : 258.18 = 56.60 : x
  2. Step 2: Convert to fraction form
    172.20/258.18 = 56.60/x
  3. Step 3: Cross multiply
    172.20x = 258.18 × 56.60
  4. Step 4: Simplify right side
    172.20x = 14,613.44
  5. Step 5: Solve for x
    x = 14,613.44/172.20
  6. Step 6: Final answer
    x = 84.86

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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.