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Finding the Fourth Proportional to 1,206.90, 1,664.82 and 813.24

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Solution

The fourth proportional to 1,206.90, 1,664.82 and 813.24 is: 1,121.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.90 : 1,664.82 = 813.24 : x
  2. Step 2: Convert to fraction form
    1,206.90/1,664.82 = 813.24/x
  3. Step 3: Cross multiply
    1,206.90x = 1,664.82 × 813.24
  4. Step 4: Simplify right side
    1,206.90x = 1,353,898.22
  5. Step 5: Solve for x
    x = 1,353,898.22/1,206.90
  6. Step 6: Final answer
    x = 1,121.80

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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.