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Finding the Fourth Proportional to 1,253.90, 1,730.39 and 811.80

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Solution

The fourth proportional to 1,253.90, 1,730.39 and 811.80 is: 1,120.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.90 : 1,730.39 = 811.80 : x
  2. Step 2: Convert to fraction form
    1,253.90/1,730.39 = 811.80/x
  3. Step 3: Cross multiply
    1,253.90x = 1,730.39 × 811.80
  4. Step 4: Simplify right side
    1,253.90x = 1,404,726.54
  5. Step 5: Solve for x
    x = 1,404,726.54/1,253.90
  6. Step 6: Final answer
    x = 1,120.28

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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.