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Finding the Fourth Proportional to 1,260.65, 1,739.78 and 763.31

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Solution

The fourth proportional to 1,260.65, 1,739.78 and 763.31 is: 1,053.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.65 : 1,739.78 = 763.31 : x
  2. Step 2: Convert to fraction form
    1,260.65/1,739.78 = 763.31/x
  3. Step 3: Cross multiply
    1,260.65x = 1,739.78 × 763.31
  4. Step 4: Simplify right side
    1,260.65x = 1,327,994.87
  5. Step 5: Solve for x
    x = 1,327,994.87/1,260.65
  6. Step 6: Final answer
    x = 1,053.42

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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.