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Finding the Fourth Proportional to 1,276.13, 1,760.37 and 855.75

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Solution

The fourth proportional to 1,276.13, 1,760.37 and 855.75 is: 1,180.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.13 : 1,760.37 = 855.75 : x
  2. Step 2: Convert to fraction form
    1,276.13/1,760.37 = 855.75/x
  3. Step 3: Cross multiply
    1,276.13x = 1,760.37 × 855.75
  4. Step 4: Simplify right side
    1,276.13x = 1,506,443.23
  5. Step 5: Solve for x
    x = 1,506,443.23/1,276.13
  6. Step 6: Final answer
    x = 1,180.48

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1.5x scale

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.