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Finding the Fourth Proportional to 1,188.44, 1,781.40 and 640.47

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Solution

The fourth proportional to 1,188.44, 1,781.40 and 640.47 is: 960.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.44 : 1,781.40 = 640.47 : x
  2. Step 2: Convert to fraction form
    1,188.44/1,781.40 = 640.47/x
  3. Step 3: Cross multiply
    1,188.44x = 1,781.40 × 640.47
  4. Step 4: Simplify right side
    1,188.44x = 1,140,933.26
  5. Step 5: Solve for x
    x = 1,140,933.26/1,188.44
  6. Step 6: Final answer
    x = 960.03

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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.