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Finding the Fourth Proportional to 1,986.64, 2,979.52 and 753.61

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Solution

The fourth proportional to 1,986.64, 2,979.52 and 753.61 is: 1,130.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.64 : 2,979.52 = 753.61 : x
  2. Step 2: Convert to fraction form
    1,986.64/2,979.52 = 753.61/x
  3. Step 3: Cross multiply
    1,986.64x = 2,979.52 × 753.61
  4. Step 4: Simplify right side
    1,986.64x = 2,245,396.07
  5. Step 5: Solve for x
    x = 2,245,396.07/1,986.64
  6. Step 6: Final answer
    x = 1,130.25

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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.