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Finding the Fourth Proportional to 461.38, 692.21 and 172.75

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Solution

The fourth proportional to 461.38, 692.21 and 172.75 is: 259.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.38 : 692.21 = 172.75 : x
  2. Step 2: Convert to fraction form
    461.38/692.21 = 172.75/x
  3. Step 3: Cross multiply
    461.38x = 692.21 × 172.75
  4. Step 4: Simplify right side
    461.38x = 119,579.28
  5. Step 5: Solve for x
    x = 119,579.28/461.38
  6. Step 6: Final answer
    x = 259.18

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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.