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Finding the Fourth Proportional to 1,308.17, 1,806.14 and 811.55

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Solution

The fourth proportional to 1,308.17, 1,806.14 and 811.55 is: 1,120.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.17 : 1,806.14 = 811.55 : x
  2. Step 2: Convert to fraction form
    1,308.17/1,806.14 = 811.55/x
  3. Step 3: Cross multiply
    1,308.17x = 1,806.14 × 811.55
  4. Step 4: Simplify right side
    1,308.17x = 1,465,779.46
  5. Step 5: Solve for x
    x = 1,465,779.46/1,308.17
  6. Step 6: Final answer
    x = 1,120.48

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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.