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Finding the Fourth Proportional to 1,811.72, 2,716.14 and 785.16

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Solution

The fourth proportional to 1,811.72, 2,716.14 and 785.16 is: 1,177.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.72 : 2,716.14 = 785.16 : x
  2. Step 2: Convert to fraction form
    1,811.72/2,716.14 = 785.16/x
  3. Step 3: Cross multiply
    1,811.72x = 2,716.14 × 785.16
  4. Step 4: Simplify right side
    1,811.72x = 2,132,604.48
  5. Step 5: Solve for x
    x = 2,132,604.48/1,811.72
  6. Step 6: Final answer
    x = 1,177.12

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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.