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Finding the Fourth Proportional to 1,316.55, 1,816.83 and 727.09

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Solution

The fourth proportional to 1,316.55, 1,816.83 and 727.09 is: 1,003.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.55 : 1,816.83 = 727.09 : x
  2. Step 2: Convert to fraction form
    1,316.55/1,816.83 = 727.09/x
  3. Step 3: Cross multiply
    1,316.55x = 1,816.83 × 727.09
  4. Step 4: Simplify right side
    1,316.55x = 1,320,998.92
  5. Step 5: Solve for x
    x = 1,320,998.92/1,316.55
  6. Step 6: Final answer
    x = 1,003.38

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1.5x scale

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.