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Finding the Fourth Proportional to 1,276.88, 1,762.29 and 779.81

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Solution

The fourth proportional to 1,276.88, 1,762.29 and 779.81 is: 1,076.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.88 : 1,762.29 = 779.81 : x
  2. Step 2: Convert to fraction form
    1,276.88/1,762.29 = 779.81/x
  3. Step 3: Cross multiply
    1,276.88x = 1,762.29 × 779.81
  4. Step 4: Simplify right side
    1,276.88x = 1,374,238.65
  5. Step 5: Solve for x
    x = 1,374,238.65/1,276.88
  6. Step 6: Final answer
    x = 1,076.25

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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.