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Finding the Fourth Proportional to 1,308.45, 1,806.48 and 811.38

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Solution

The fourth proportional to 1,308.45, 1,806.48 and 811.38 is: 1,120.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.45 : 1,806.48 = 811.38 : x
  2. Step 2: Convert to fraction form
    1,308.45/1,806.48 = 811.38/x
  3. Step 3: Cross multiply
    1,308.45x = 1,806.48 × 811.38
  4. Step 4: Simplify right side
    1,308.45x = 1,465,741.74
  5. Step 5: Solve for x
    x = 1,465,741.74/1,308.45
  6. Step 6: Final answer
    x = 1,120.21

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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.