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Finding the Fourth Proportional to 1,786.50, 2,679.39 and 553.86

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Solution

The fourth proportional to 1,786.50, 2,679.39 and 553.86 is: 830.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.50 : 2,679.39 = 553.86 : x
  2. Step 2: Convert to fraction form
    1,786.50/2,679.39 = 553.86/x
  3. Step 3: Cross multiply
    1,786.50x = 2,679.39 × 553.86
  4. Step 4: Simplify right side
    1,786.50x = 1,484,006.95
  5. Step 5: Solve for x
    x = 1,484,006.95/1,786.50
  6. Step 6: Final answer
    x = 830.68

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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.