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Finding the Fourth Proportional to 1,216.62, 1,826.61 and 669.66

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Solution

The fourth proportional to 1,216.62, 1,826.61 and 669.66 is: 1,005.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.62 : 1,826.61 = 669.66 : x
  2. Step 2: Convert to fraction form
    1,216.62/1,826.61 = 669.66/x
  3. Step 3: Cross multiply
    1,216.62x = 1,826.61 × 669.66
  4. Step 4: Simplify right side
    1,216.62x = 1,223,207.65
  5. Step 5: Solve for x
    x = 1,223,207.65/1,216.62
  6. Step 6: Final answer
    x = 1,005.41

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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.