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Finding the Fourth Proportional to 172.21, 258.14 and 56.57

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Solution

The fourth proportional to 172.21, 258.14 and 56.57 is: 84.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.21 : 258.14 = 56.57 : x
  2. Step 2: Convert to fraction form
    172.21/258.14 = 56.57/x
  3. Step 3: Cross multiply
    172.21x = 258.14 × 56.57
  4. Step 4: Simplify right side
    172.21x = 14,602.98
  5. Step 5: Solve for x
    x = 14,602.98/172.21
  6. Step 6: Final answer
    x = 84.80

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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.