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Finding the Fourth Proportional to 1,189.80, 1,785.26 and 459.64

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Solution

The fourth proportional to 1,189.80, 1,785.26 and 459.64 is: 689.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.80 : 1,785.26 = 459.64 : x
  2. Step 2: Convert to fraction form
    1,189.80/1,785.26 = 459.64/x
  3. Step 3: Cross multiply
    1,189.80x = 1,785.26 × 459.64
  4. Step 4: Simplify right side
    1,189.80x = 820,576.91
  5. Step 5: Solve for x
    x = 820,576.91/1,189.80
  6. Step 6: Final answer
    x = 689.68

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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.