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Finding the Fourth Proportional to 1,786.61, 2,679.46 and 553.69

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Solution

The fourth proportional to 1,786.61, 2,679.46 and 553.69 is: 830.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.61 : 2,679.46 = 553.69 : x
  2. Step 2: Convert to fraction form
    1,786.61/2,679.46 = 553.69/x
  3. Step 3: Cross multiply
    1,786.61x = 2,679.46 × 553.69
  4. Step 4: Simplify right side
    1,786.61x = 1,483,590.21
  5. Step 5: Solve for x
    x = 1,483,590.21/1,786.61
  6. Step 6: Final answer
    x = 830.39

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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.