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Finding the Fourth Proportional to 1,261.29, 1,739.91 and 857.37

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Solution

The fourth proportional to 1,261.29, 1,739.91 and 857.37 is: 1,182.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.29 : 1,739.91 = 857.37 : x
  2. Step 2: Convert to fraction form
    1,261.29/1,739.91 = 857.37/x
  3. Step 3: Cross multiply
    1,261.29x = 1,739.91 × 857.37
  4. Step 4: Simplify right side
    1,261.29x = 1,491,746.64
  5. Step 5: Solve for x
    x = 1,491,746.64/1,261.29
  6. Step 6: Final answer
    x = 1,182.72

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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.