Home / 1,308.08-1,806.57-811.91

Finding the Fourth Proportional to 1,308.08, 1,806.57 and 811.91

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Solution

The fourth proportional to 1,308.08, 1,806.57 and 811.91 is: 1,121.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.08 : 1,806.57 = 811.91 : x
  2. Step 2: Convert to fraction form
    1,308.08/1,806.57 = 811.91/x
  3. Step 3: Cross multiply
    1,308.08x = 1,806.57 × 811.91
  4. Step 4: Simplify right side
    1,308.08x = 1,466,763.22
  5. Step 5: Solve for x
    x = 1,466,763.22/1,308.08
  6. Step 6: Final answer
    x = 1,121.31

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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.