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Finding the Fourth Proportional to 172.43, 258.65 and 64.21

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Solution

The fourth proportional to 172.43, 258.65 and 64.21 is: 96.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.43 : 258.65 = 64.21 : x
  2. Step 2: Convert to fraction form
    172.43/258.65 = 64.21/x
  3. Step 3: Cross multiply
    172.43x = 258.65 × 64.21
  4. Step 4: Simplify right side
    172.43x = 16,607.92
  5. Step 5: Solve for x
    x = 16,607.92/172.43
  6. Step 6: Final answer
    x = 96.32

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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.