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Finding the Fourth Proportional to 1,304.68, 1,954.50 and 811.28

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Solution

The fourth proportional to 1,304.68, 1,954.50 and 811.28 is: 1,215.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,304.68 : 1,954.50 = 811.28 : x
  2. Step 2: Convert to fraction form
    1,304.68/1,954.50 = 811.28/x
  3. Step 3: Cross multiply
    1,304.68x = 1,954.50 × 811.28
  4. Step 4: Simplify right side
    1,304.68x = 1,585,648.33
  5. Step 5: Solve for x
    x = 1,585,648.33/1,304.68
  6. Step 6: Final answer
    x = 1,215.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.