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Finding the Fourth Proportional to 1,786.65, 2,679.76 and 553.83

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Solution

The fourth proportional to 1,786.65, 2,679.76 and 553.83 is: 830.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.65 : 2,679.76 = 553.83 : x
  2. Step 2: Convert to fraction form
    1,786.65/2,679.76 = 553.83/x
  3. Step 3: Cross multiply
    1,786.65x = 2,679.76 × 553.83
  4. Step 4: Simplify right side
    1,786.65x = 1,484,131.48
  5. Step 5: Solve for x
    x = 1,484,131.48/1,786.65
  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.