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Finding the Fourth Proportional to 1,308.88, 1,805.25 and 811.81

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Solution

The fourth proportional to 1,308.88, 1,805.25 and 811.81 is: 1,119.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.88 : 1,805.25 = 811.81 : x
  2. Step 2: Convert to fraction form
    1,308.88/1,805.25 = 811.81/x
  3. Step 3: Cross multiply
    1,308.88x = 1,805.25 × 811.81
  4. Step 4: Simplify right side
    1,308.88x = 1,465,520.00
  5. Step 5: Solve for x
    x = 1,465,520.00/1,308.88
  6. Step 6: Final answer
    x = 1,119.67

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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.