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Finding the Fourth Proportional to 1,131.81, 1,561.78 and 712.13

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Solution

The fourth proportional to 1,131.81, 1,561.78 and 712.13 is: 982.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.81 : 1,561.78 = 712.13 : x
  2. Step 2: Convert to fraction form
    1,131.81/1,561.78 = 712.13/x
  3. Step 3: Cross multiply
    1,131.81x = 1,561.78 × 712.13
  4. Step 4: Simplify right side
    1,131.81x = 1,112,183.47
  5. Step 5: Solve for x
    x = 1,112,183.47/1,131.81
  6. Step 6: Final answer
    x = 982.66

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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.