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Finding the Fourth Proportional to 1,986.01, 2,979.50 and 687.49

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Solution

The fourth proportional to 1,986.01, 2,979.50 and 687.49 is: 1,031.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.01 : 2,979.50 = 687.49 : x
  2. Step 2: Convert to fraction form
    1,986.01/2,979.50 = 687.49/x
  3. Step 3: Cross multiply
    1,986.01x = 2,979.50 × 687.49
  4. Step 4: Simplify right side
    1,986.01x = 2,048,376.46
  5. Step 5: Solve for x
    x = 2,048,376.46/1,986.01
  6. Step 6: Final answer
    x = 1,031.40

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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.