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Finding the Fourth Proportional to 1,811.76, 2,719.08 and 786.48

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Solution

The fourth proportional to 1,811.76, 2,719.08 and 786.48 is: 1,180.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.76 : 2,719.08 = 786.48 : x
  2. Step 2: Convert to fraction form
    1,811.76/2,719.08 = 786.48/x
  3. Step 3: Cross multiply
    1,811.76x = 2,719.08 × 786.48
  4. Step 4: Simplify right side
    1,811.76x = 2,138,502.04
  5. Step 5: Solve for x
    x = 2,138,502.04/1,811.76
  6. Step 6: Final answer
    x = 1,180.35

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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.