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Finding the Fourth Proportional to 1,206.66, 1,664.88 and 813

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Solution

The fourth proportional to 1,206.66, 1,664.88 and 813 is: 1,121.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.66 : 1,664.88 = 813 : x
  2. Step 2: Convert to fraction form
    1,206.66/1,664.88 = 813/x
  3. Step 3: Cross multiply
    1,206.66x = 1,664.88 × 813
  4. Step 4: Simplify right side
    1,206.66x = 1,353,547.44
  5. Step 5: Solve for x
    x = 1,353,547.44/1,206.66
  6. Step 6: Final answer
    x = 1,121.73

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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.