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Finding the Fourth Proportional to 611.21, 916.73 and 172.43

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Solution

The fourth proportional to 611.21, 916.73 and 172.43 is: 258.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.21 : 916.73 = 172.43 : x
  2. Step 2: Convert to fraction form
    611.21/916.73 = 172.43/x
  3. Step 3: Cross multiply
    611.21x = 916.73 × 172.43
  4. Step 4: Simplify right side
    611.21x = 158,066.31
  5. Step 5: Solve for x
    x = 158,066.31/611.21
  6. Step 6: Final answer
    x = 258.61

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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.