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Finding the Fourth Proportional to 1,172.33, 1,617.38 and 717.93

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Solution

The fourth proportional to 1,172.33, 1,617.38 and 717.93 is: 990.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.33 : 1,617.38 = 717.93 : x
  2. Step 2: Convert to fraction form
    1,172.33/1,617.38 = 717.93/x
  3. Step 3: Cross multiply
    1,172.33x = 1,617.38 × 717.93
  4. Step 4: Simplify right side
    1,172.33x = 1,161,157.54
  5. Step 5: Solve for x
    x = 1,161,157.54/1,172.33
  6. Step 6: Final answer
    x = 990.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.