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Finding the Fourth Proportional to 1,189.94, 1,785.42 and 641.48

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Solution

The fourth proportional to 1,189.94, 1,785.42 and 641.48 is: 962.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.94 : 1,785.42 = 641.48 : x
  2. Step 2: Convert to fraction form
    1,189.94/1,785.42 = 641.48/x
  3. Step 3: Cross multiply
    1,189.94x = 1,785.42 × 641.48
  4. Step 4: Simplify right side
    1,189.94x = 1,145,302.29
  5. Step 5: Solve for x
    x = 1,145,302.29/1,189.94
  6. Step 6: Final answer
    x = 962.49

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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.