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Finding the Fourth Proportional to 1,986.30, 2,979.42 and 753.57

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Solution

The fourth proportional to 1,986.30, 2,979.42 and 753.57 is: 1,130.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.30 : 2,979.42 = 753.57 : x
  2. Step 2: Convert to fraction form
    1,986.30/2,979.42 = 753.57/x
  3. Step 3: Cross multiply
    1,986.30x = 2,979.42 × 753.57
  4. Step 4: Simplify right side
    1,986.30x = 2,245,201.53
  5. Step 5: Solve for x
    x = 2,245,201.53/1,986.30
  6. Step 6: Final answer
    x = 1,130.34

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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.