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Finding the Fourth Proportional to 1,276.90, 1,762.43 and 779.96

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Solution

The fourth proportional to 1,276.90, 1,762.43 and 779.96 is: 1,076.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.90 : 1,762.43 = 779.96 : x
  2. Step 2: Convert to fraction form
    1,276.90/1,762.43 = 779.96/x
  3. Step 3: Cross multiply
    1,276.90x = 1,762.43 × 779.96
  4. Step 4: Simplify right side
    1,276.90x = 1,374,624.90
  5. Step 5: Solve for x
    x = 1,374,624.90/1,276.90
  6. Step 6: Final answer
    x = 1,076.53

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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.