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Finding the Fourth Proportional to 2,003.51, 3,005.68 and 687.36

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Solution

The fourth proportional to 2,003.51, 3,005.68 and 687.36 is: 1,031.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,003.51 : 3,005.68 = 687.36 : x
  2. Step 2: Convert to fraction form
    2,003.51/3,005.68 = 687.36/x
  3. Step 3: Cross multiply
    2,003.51x = 3,005.68 × 687.36
  4. Step 4: Simplify right side
    2,003.51x = 2,065,984.20
  5. Step 5: Solve for x
    x = 2,065,984.20/2,003.51
  6. Step 6: Final answer
    x = 1,031.18

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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.