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Finding the Fourth Proportional to 1,188.47, 1,783.47 and 641.03

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Solution

The fourth proportional to 1,188.47, 1,783.47 and 641.03 is: 961.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.47 : 1,783.47 = 641.03 : x
  2. Step 2: Convert to fraction form
    1,188.47/1,783.47 = 641.03/x
  3. Step 3: Cross multiply
    1,188.47x = 1,783.47 × 641.03
  4. Step 4: Simplify right side
    1,188.47x = 1,143,255.37
  5. Step 5: Solve for x
    x = 1,143,255.37/1,188.47
  6. Step 6: Final answer
    x = 961.96

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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.