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Finding the Fourth Proportional to 1,172.57, 1,755.81 and 685.35

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Solution

The fourth proportional to 1,172.57, 1,755.81 and 685.35 is: 1,026.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.57 : 1,755.81 = 685.35 : x
  2. Step 2: Convert to fraction form
    1,172.57/1,755.81 = 685.35/x
  3. Step 3: Cross multiply
    1,172.57x = 1,755.81 × 685.35
  4. Step 4: Simplify right side
    1,172.57x = 1,203,344.38
  5. Step 5: Solve for x
    x = 1,203,344.38/1,172.57
  6. Step 6: Final answer
    x = 1,026.25

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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.