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Finding the Fourth Proportional to 1,987.97, 2,979.95 and 755.06

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Solution

The fourth proportional to 1,987.97, 2,979.95 and 755.06 is: 1,131.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.97 : 2,979.95 = 755.06 : x
  2. Step 2: Convert to fraction form
    1,987.97/2,979.95 = 755.06/x
  3. Step 3: Cross multiply
    1,987.97x = 2,979.95 × 755.06
  4. Step 4: Simplify right side
    1,987.97x = 2,250,022.37
  5. Step 5: Solve for x
    x = 2,250,022.37/1,987.97
  6. Step 6: Final answer
    x = 1,131.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.