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Finding the Fourth Proportional to 1,305.78, 1,801.96 and 716.31

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Solution

The fourth proportional to 1,305.78, 1,801.96 and 716.31 is: 988.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.78 : 1,801.96 = 716.31 : x
  2. Step 2: Convert to fraction form
    1,305.78/1,801.96 = 716.31/x
  3. Step 3: Cross multiply
    1,305.78x = 1,801.96 × 716.31
  4. Step 4: Simplify right side
    1,305.78x = 1,290,752.96
  5. Step 5: Solve for x
    x = 1,290,752.96/1,305.78
  6. Step 6: Final answer
    x = 988.49

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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.