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Finding the Fourth Proportional to 1,276.59, 1,762.28 and 857.23

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Solution

The fourth proportional to 1,276.59, 1,762.28 and 857.23 is: 1,183.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.59 : 1,762.28 = 857.23 : x
  2. Step 2: Convert to fraction form
    1,276.59/1,762.28 = 857.23/x
  3. Step 3: Cross multiply
    1,276.59x = 1,762.28 × 857.23
  4. Step 4: Simplify right side
    1,276.59x = 1,510,675.00
  5. Step 5: Solve for x
    x = 1,510,675.00/1,276.59
  6. Step 6: Final answer
    x = 1,183.37

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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.