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Finding the Fourth Proportional to 1,180.03, 1,628.90 and 786.91

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Solution

The fourth proportional to 1,180.03, 1,628.90 and 786.91 is: 1,086.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.03 : 1,628.90 = 786.91 : x
  2. Step 2: Convert to fraction form
    1,180.03/1,628.90 = 786.91/x
  3. Step 3: Cross multiply
    1,180.03x = 1,628.90 × 786.91
  4. Step 4: Simplify right side
    1,180.03x = 1,281,797.70
  5. Step 5: Solve for x
    x = 1,281,797.70/1,180.03
  6. Step 6: Final answer
    x = 1,086.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.