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Finding the Fourth Proportional to 1,187.79, 1,782.09 and 640.03

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Solution

The fourth proportional to 1,187.79, 1,782.09 and 640.03 is: 960.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.79 : 1,782.09 = 640.03 : x
  2. Step 2: Convert to fraction form
    1,187.79/1,782.09 = 640.03/x
  3. Step 3: Cross multiply
    1,187.79x = 1,782.09 × 640.03
  4. Step 4: Simplify right side
    1,187.79x = 1,140,578.95
  5. Step 5: Solve for x
    x = 1,140,578.95/1,187.79
  6. Step 6: Final answer
    x = 960.26

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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.